5.1 2声道音量控制芯片PT2257工作原理
5.1.1概述与特点
PT2257 是由CMOS 技术制造而成的2 声道音量控制芯片，只有8 个脚位，采用I2C 总线控制接口，具备0～-79dB 的衰减范围，低噪声，高立体声分离度及使用极少的周边元件，是21世纪AV 视听产品必备的极佳音量控制元件。
特色：
衰减率：0～-79dB，1dB/每级。
工作电压范围4～9V。
低噪声，S/N>100dB(A-Weighting)。
高立体声分离度>88dB。
需求极少的周边元件。
二声道输出。
DIP 与SOP 型式包装。
应用：
AV 环绕视呼音响、汽车音响、mini-compo电脑周边多媒体喇叭、其他音响相关的应用。
;******************************************************************
;Project :
;Client :
;Create :
;Data :2007-12-13
;Version :V0.0;
;Description:
;******************************************************************
;=============>>>>>>>><<<<<<<<=================
INCLUDE "F:ProjectInclude FileEM78P156.INC"
;Defined the TEMP register
VOL_MAIN EQU 0X10;
VOL_FRO EQU 0X11;
VOL_CEN EQU 0X12;
VOL_SUB EQU 0X13;
VOL_SUR EQU 0X14;
;-----------------------------------------------
STATE EQU 0X15;
F_POWER EQU 0;
F_MUTE EQU 1;
F_ERROR EQU 3;
F_REML EQU 4;
ADJ EQU 0X16;
F_FRO EQU 0;
F_CEN EQU 1;
F_SUR EQU 2;
F_SUB EQU 3;
F_MAIN EQU 4;
NEW_KEY EQU 0X17;
OLD_KEY EQU 0X18;
LST_KEY EQU 0X19;
KREM EQU 0X1A;
K_MASU EQU 0;
K_MASD EQU 1;
KCOM EQU 0X1B;
K_MUTE EQU 0;
K_AUX EQU 1;
K_FM EQU 2;
K_RESET EQU 3;
K_INPUT EQU 4;
K_SCAN EQU 5;
T_8MS EQU 0X1E;
T_120MS EQU 0X1F;
C_WIDTH EQU 0X20;
T_REML EQU 0X21;
T_3S EQU 0X23;
X0 EQU 0X24;
X1 EQU 0X25;
Y0 EQU 0X26;
Y1 EQU 0X27;
I EQU 0X29;
J EQU 0X2A;
STATE_BUF EQU 0X2B;
ACC_BUF EQU 0X2C;
TIME EQU 0X2D;
F_120MS EQU 0;
F_500MS EQU 1;
F_DISP EQU 2;
F_SCAN EQU 3;
F_FLASH EQU 4;
F_END EQU 5;
R_BIT EQU 0X2E;
T_FLASH EQU 0X30;
B_FLASH0 EQU 3;
B_FLASH1 EQU 6;
B_FLASH2 EQU 7;
T_PRES EQU 0X31;
BAK_KEY0 EQU 0X32;
BAK_KEY1 EQU 0X33;
DSP_BUF0 EQU 0X34;
L_PLAY EQU 1;
L_STBY EQU 0;
R_INPUT EQU 0X35;
B_AUX EQU 0;
B_FM EQU 1;
T_TRIGGER EQU 0X36
;=============>>>>>>>><<<<<<<<=================
;Defined the I/O Port
PCON EQU 6;
P_4052A EQU 2;
P_4052B EQU 3;
PPT EQU 5;
P_SCL EQU 2;
P_SDA EQU 3;
PFM EQU 6;
P_SCAN EQU 0;
P_REST EQU 1;
PRMT EQU 6;
P_REC EQU 7;
PKEY EQU 6;
PLED EQU 5;
;=============>>>>>>>><<<<<<<<=================
;Defined the TEMP data
INI_P5 EQU 0B00000000;
INI_P6 EQU 0B11111100;
IO_P5 EQU 0B00000000;
IO_P6 EQU 0B11110000;
;******************************************
;PT2257 channels address
;PT2257 Channel Number
ADDR_2257 EQU 0X88;
CH_LH EQU 0xB0;
CH_LL EQU 0xA0;
CH_RH EQU 0x30;0X00;0XA0;0X20;
CH_RL EQU 0x20;0X10;0XB0;0X30;
CH_MH EQU 0XE0;0x00;
CH_ML EQU 0XD0;0x10;
INI_VOL EQU 39;24;34
MIN_MAIN EQU 79;
MIN_VOL EQU 79;
INI_MAIN EQU 34;
V_120MS EQU 15;
V_3S EQU 100;
V_NONEKEY EQU 0XFF;
V_TRIGGER EQU 35;
;----------------------------------------------
;IR Remote Code
CHECK_CODEL EQU 0X03;
CHECK_CODEH EQU 0XFC;
VALUE_AUX EQU 0XFF
VALUE_FM EQU 0XF1
VALUE_MUTE EQU 0XFE;
VALUE_MASU EQU 0XF3;
VALUE_MASD EQU 0XF6;
VALUE_RESET EQU 0XF9;
VALUE_SCAN EQU 0XEB;
;--------------------------------
VPLAN_MUTE EQU 0B01111111;
VPLAN_INPUT EQU 0B11011111;
VPLAN_VOLU EQU 0B11101111;
VPLAN_VOLD EQU 0B10111111;
;=============>>>>>>>><<<<<<<<=================
ORG 0X3FF;
JMP START;
ORG 0X000;
JMP START;
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
ORG 0X008;
MOV ACC_BUF,A;
SWAP ACC_BUF;
SWAPA STATUS;
MOV STATE_BUF,A;
JMP INTERRUPT;
;=============>>>>>>>><<<<<<<<=================
INI_RAM:
MOV A, @0X10;
MOV FSR, A;
L_CLEAR:
CLR INDF;
INC FSR;
MOV A, FSR;
AND A, @0X3F;
XOR A, @0X3F;
JBS STATUS, Z;
JMP L_CLEAR;
;---------------------------------
;Ram loading the initial value
MOV A, @INI_MAIN;
MOV VOL_MAIN, A;
BS R_INPUT, B_AUX;;
BS STATE, F_POWER;
RET;
;=============>>>>>>>><<<<<<<<=================
INI_PORT:
MOV A, @INI_P5;
MOV PORT5, A;
MOV A, @INI_P6;
MOV PORT6, A;
MOV A, @IO_P5;
IOW PORT5;
MOV A, @IO_P6;
IOW PORT6;
MOV A, @0X80
IOW IOCE;
;---------------------------------
;Set I/O Port Initial state
BC PCON, P_4052A;
BC PCON, P_4052B;
RET;
;=============>>>>>>>><<<<<<<<=================
INI_INT:
DISI;
CLR INTF;
MOV A, @0X05;
CONTW; 1:64 To TCC
MOV A, @0X01;
IOW INTC; Enable the TCC interrupt;
ENI;
RET;
;=============>>>>>>>><<<<<<<<=================
INI_PT2257:
CALL DLY05S;
MOV A, @0XFF;;
MOV Y0, A;
MOV A, @0X78;
MOV Y1,A;
CALL PT2257;
JBS STATE, F_ERROR;
JMP PT_NEXT;
CALL DLY05S;
MOV A, @0XFF;
MOV Y0, A;
MOV A, @0X78;
MOV Y1,A;
CALL PT2257;
PT_NEXT:
CALL LOAD_MAIN;
RET;
;=============>>>>>>>><<<<<<<<=================
;=============>>>>>>>><<<<<<<<=================
START:
WDTC;
CALL INI_RAM;
CALL INI_PORT;
CALL INI_INT;
CALL INI_PT2257;
CALL DLY05S;
CALL DLY05S;
MAIN:
WDTC;
CALL REMOTE;
CALL DISPLAY;
CALL KEY_SCAN;
JBS STATE, F_POWER;
JMP MAIN;
CALL COMM_MUTE;
JBC STATE, F_MUTE;
JMP MAIN;
CALL COMM_INPUT
CALL COMM_AUX;
CALL COMM_FM
CALL COMM_SCAN
CALL COMM_RESET
CALL COMM_MU;
CALL COMM_MD;
JMP MAIN;
;=============>>>>>>>><<<<<<<<=================
COMM_MUTE:
JBS KCOM, K_MUTE;
RET;
BC KCOM, K_MUTE;
JBS STATE, F_MUTE;
JMP MUTE_ON;
MUTE_OFF:
BC STATE, F_MUTE;
CLR KCOM;
CLR KREM;
MOV A, @0X78;
MOV Y0,A;
CLR Y1;
CALL PT2257;
RET;
;=================================================
MUTE_ON:
BS STATE, F_MUTE;
CLR T_FLASH;
MOV A, @0X79;
MOV Y0,A;
CLR Y1;
CALL PT2257;
RET;
;=============>>>>>>>><<<<<<<<=================
COMM_INPUT:
JBS KCOM, K_INPUT;
RET;
BC KCOM, K_INPUT;
;----------------------------------------------
BC STATUS, C;
RLC R_INPUT;
MOV A,@0X03
AND R_INPUT,A
JBC STATUS, Z;
BS R_INPUT,B_AUX;
INPUT_SELECT:
JBC R_INPUT, B_FM;
JMP SHIFT_FM;
JMP SHIFT_AUX
;**************************************
COMM_AUX:
JBS KCOM, K_AUX;
RET;
BC KCOM, K_AUX;
CLR R_INPUT;
BS R_INPUT,B_AUX;
SHIFT_AUX:
BC PCON,P_4052A;
BC PCON,P_4052B;
RET;
;<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
COMM_FM:
JBS KCOM, K_FM;
RET;
BC KCOM, K_FM;
CLR R_INPUT;
BS R_INPUT,B_FM;
SHIFT_FM:
BS PCON,P_4052A;
BS PCON,P_4052B;
RET;
;===========>>>>>>>>>>>>>><<<<<<<<<<<<============
COMM_SCAN:
JBS KCOM, K_SCAN;
RET;
BC KCOM, K_SCAN;
JBC R_INPUT,B_AUX;
RET;
CLR T_TRIGGER;
BS PFM, P_SCAN;
BC PFM, P_REST;
RET;
;===========>>>>>>>>>>>>>><<<<<<<<<<<<============
COMM_RESET:
JBS KCOM, K_RESET;
RET;
BC KCOM, K_RESET;
JBC R_INPUT,B_AUX;
RET;
CLR T_TRIGGER;
BC PFM, P_SCAN;
BS PFM, P_REST;
RET;
;=================>>>>>>>>>>>>>>>>>>>================
COMM_MU:
JBS KREM, K_MASU;
RET;
BC KREM, K_MASU;
CALL CLEAR_FLAG;
BS ADJ,F_MAIN;
A_MU:
MOV A, VOL_MAIN;
JBS STATUS, Z;
DEC VOL_MAIN;
JBC STATUS, Z;
BS TIME, F_END;
LOAD_MAIN:
MOV A, VOL_MAIN;;
CALL HTD;
MOV A, X0;
AND A, @0XF;
OR A, @CH_LL;
MOV Y1,A;
SWAPA X0;
AND A, @0XF;
OR A, @CH_LH;
MOV Y0,A;
CALL PT2257;
MOV A,X0;
AND A, @0XF;
OR A, @CH_RL;
MOV Y1,A;
SWAPA X0;
AND A, @0XF;
OR A, @CH_RH;
MOV Y0,A;
CALL PT2257;
RET;
;================================================
CLEAR_FLAG:
CLR T_3S;
CLR ADJ;
BS TIME, F_FLASH;
BC TIME, F_END;
RET;
;=============>>>>>>>><<<<<<<<=================
COMM_MD:
JBS KREM, K_MASD;
RET;
BC KREM, K_MASD;
CALL CLEAR_FLAG;
BS ADJ,F_MAIN;
A_MD:
INC VOL_MAIN;
MOV A, VOL_MAIN;
SUB A, @MIN_VOL;
MOV A, @MIN_VOL;
JBS STATUS, C;
MOV VOL_MAIN, A;
;================================================
JBS STATUS, C;
BS TIME, F_END;
JMP LOAD_MAIN;
;=============>>>>>>>><<<<<<<<=================
REMOTE:
JBS PRMT, P_REC;
JMP START_REC;
;----------------------------
JBS TIME, F_120MS;
RET;
BC TIME, F_120MS;
BC STATE,F_REML;
BC TIME, F_500MS;
RET;
;-------------------------------------------------
START_REC:
WDTC;
CLR C_WIDTH;
L_REC_LOW:
JBC PRMT, P_REC;
JMP REC_NEXT_LOW;
CALL DLY01MS;
INC C_WIDTH;
MOV A, @120;
SUB A, C_WIDTH;
JBS STATUS, C;
JMP L_REC_LOW;
CLR C_WIDTH;
RET;
;-----------------------------
REC_NEXT_LOW:
MOV A, @60;
SUB A, C_WIDTH;
JBC STATUS,C;
JMP REC_HIG;
CLR C_WIDTH;
RET;
REC_HIG:
CLR C_WIDTH;
L_REC_HIG:
JBS PRMT,P_REC;
JMP START_CODE;
CALL DLY01MS;
INC C_WIDTH;
MOV A, @55;
SUB A, C_WIDTH;
JBS STATUS,C;
JMP L_REC_HIG;
CLR C_WIDTH;
RET;
;-------------------------------------------
START_CODE:
MOV A, @35;
SUB A, C_WIDTH;
JBC STATUS,C;
JMP REC_DATA;
MOV A, @15;
SUB A, C_WIDTH;
JBC STATUS,C;
JMP REC_END;
CLR C_WIDTH;
RET;
;---------------RECEIVED DATA----------------
REC_DATA:
CLR C_WIDTH;
MOV A,@32;
MOV J,A;
L_REC_DATA_LOW:
JBC PRMT,P_REC;
JMP REC_DATA_HIG;
CALL DLY01MS;
INC C_WIDTH;
MOV A,@10;
SUB A,C_WIDTH;
JBS STATUS,C;
JMP L_REC_DATA_LOW;
CLR C_WIDTH;
RET;
;--------------------------
REC_DATA_HIG:
CLR C_WIDTH;
L_REC_DATA_HIG:
JBS PRMT,P_REC;
JMP REC_NEXT_BIT;
CALL DLY01MS;
INC C_WIDTH;
MOV A,@23;
SUB A,C_WIDTH;
JBS STATUS,C;
JMP L_REC_DATA_HIG;
CLR C_WIDTH;
RET;
;---------------------------
REC_NEXT_BIT:
MOV A, @12;
SUB A, C_WIDTH;
RRC X0;
RRC X1;
RRC Y0;
RRC Y1;
CLR C_WIDTH;
DJZ J;
JMP L_REC_DATA_LOW;
;---------------Remote Code check-----------------
MOV A, @CHECK_CODEL;
XOR A,Y1;
JBS STATUS,Z;
RET;
MOV A, @CHECK_CODEH;;
XOR A,Y0;
JBS STATUS,Z;
RET;
COMA X1;
XOR A,X0;
JBS STATUS,Z;
RET;
;-------------------------------------------------;
MOV A, @VALUE_MUTE;
XOR A, X0;
JBC STATUS, Z;
BS KCOM, K_MUTE;
MOV A, @VALUE_RESET;
XOR A, X0;
JBC STATUS, Z;
BS KCOM, K_RESET;
MOV A, @VALUE_SCAN;
XOR A, X0;
JBC STATUS,Z;
BS KCOM, K_SCAN;
MOV A, @VALUE_MASU;
XOR A, X0;
JBC STATUS, Z;
BS KREM, K_MASU;
MOV A, @VALUE_MASD;
XOR A, X0;
JBC STATUS, Z;
BS KREM, K_MASD;
MOV A, @VALUE_AUX;
XOR A, X0;
JBC STATUS, Z;
BS KCOM, K_AUX;
MOV A,@VALUE_FM;
XOR A, X0;
JBC STATUS, Z;
BS KCOM, K_FM;
MOV A, KREM;
MOV BAK_KEY0, A;
MOV A, KCOM;
AND A, @0B11000000;
MOV BAK_KEY1, A;
BS STATE, F_REML;
BC TIME, F_120MS;
CLR T_120MS;
CLR T_REML;
RET;
;-------------------------------------------
REC_END:
CLR T_120MS;
BC TIME, F_120MS;
JBS STATE, F_REML;
RET;
JBC TIME, F_500MS;
JMP REC_L;
INC T_REML;
JBS T_REML, 3;
RET;
BS TIME, F_500MS;
REC_L:
MOV A, BAK_KEY0;
MOV KREM, A;
MOV A, BAK_KEY1;
MOV KCOM, A;
RET;
;=============>>>>>>>><<<<<<<<=================
DLY01MS:
WDTC;
MOV A, @50
MOV I, A
L_DLY01MS:
NOP;
DJZ I;
JMP L_DLY01MS
RET
;=============>>>>>>>><<<<<<<<=================
DLY05S:
MOV A, @200;
MOV I, A;
L_DLY0:
WDTC;
MOV A, @250;
MOV J, A;
L_DLY1:
JMP $+1;
JMP $+1;
JMP $+1;
JMP $+1;
JMP $+1;
JMP $+1;
JMP $+1;
JMP $+1;
NOP
DJZ J;
JMP L_DLY1;
DJZ I;
JMP L_DLY0;
RET;
;=============>>>>>>>><<<<<<<<=================
DLY15US:
MOV A, @5;
MOV I, A;
L_15US:
JMP $+1;
JMP $+1;
JMP $+1;
DJZ I;
JMP L_15US;
RET;
;=============>>>>>>>><<<<<<<<=================
PT2257:
BS PPT, P_SCL;
BS PPT, P_SDA;
CALL DLY15US;
BC PPT, P_SDA;
CALL DLY15US;
BC PPT, P_SCL;
MOV A, @ADDR_2257;
MOV X1, A;
CALL SEND_DATA;
MOV A, Y0;
MOV X1, A;
CALL SEND_DATA;
MOV A, Y1;
JBC STATUS, Z;
JMP STOPBIT;
MOV X1, A;
CALL SEND_DATA;
STOPBIT:
BC PPT, P_SDA;
CALL DLY15US;
BS PPT, P_SCL;
CALL DLY15US;
BS PPT, P_SDA;
RET;
SEND_DATA:
MOV A, @8;
MOV I, A;
L_SEND:
BC PPT, P_SCL;
RLC X1;
JBS STATUS, C;
BC PPT, P_SDA;
JBC STATUS, C;
BS PPT, P_SDA;
JMP $+1;
JMP $+1;
BS PPT, P_SCL;
JMP $+1;
JMP $+1;
DJZ I;
JMP L_SEND;
BC PPT, P_SCL
IOR PPT;
MOV R_BIT, A;
BS R_BIT, P_SDA;
MOV A, R_BIT;
IOW PPT;
; BC PPT, P_SCL;
JMP $+1;
JMP $+1;
BS PPT, P_SCL;
BC STATE,F_ERROR;
JBC PPT, P_SDA;
BS STATE,F_ERROR;
BC PPT, P_SCL;
BC PPT, P_SDA;
BC R_BIT, P_SDA;
MOV A, R_BIT;
IOW PPT;
RET;
;----------->>>>>>>>><<<<<<<<---------------
HTD:
MOV Y0, A;
CLR X0;
L_HTD:
MOV A, @10;
SUB A, Y0;
JBS STATUS, C;
JMP HTD_EXIT;
INC X0;
MOV Y0, A;
JMP L_HTD;
HTD_EXIT:
SWAP X0;
MOV A, Y0;
OR A, X0;
MOV X0, A;
RET;
;==============>>>>>>>><<<<<<<<==================
;-------------------------------------------------
;==============>>>>>>>><<<<<<<<==================
DISPLAY:
JBS TIME, F_DISP;
RET;
BC TIME, F_DISP;
;-------------------------------------------------
DISP_INTI:
MOV A,@0XFC;
AND PLED,A;
MOV A,@0X00;
MOV DSP_BUF0,A;
;-------------------------------------------------
DISP_START:
JBC STATE, F_POWER;
JMP DISP_POWON;
DISP_POWOFF:
JBC T_FLASH,B_FLASH2;
BS DSP_BUF0,L_STBY;
JMP DISP_LOAD;
DISP_POWON:
BS DSP_BUF0,L_PLAY;
JBS STATE, F_MUTE;
JMP DISP_ADJUST;
JBC T_FLASH,B_FLASH1;
BS DSP_BUF0,L_STBY;
;-------------------------------------------------
DISP_ADJUST:
JBC TIME, F_END;
JMP DISP_LOAD
JBS TIME, F_FLASH;
JMP DISP_LOAD
JBS T_FLASH,B_FLASH0;
BC DSP_BUF0,L_PLAY;
;***************************************************
DISP_LOAD:
MOV A, DSP_BUF0;
OR PLED, A;
RET
;------------------------------------------------
;------------------------------------------------
KEY_SCAN:
JBS TIME, F_SCAN;
RET;
BC TIME, F_S |
楼主
标题置顶
标题高亮
