下面是SH67P847的PDF说明:
Port Interrupt
The PORTA.3 are used as external port interrupt sources. Only the voltage transition from VDD to GND applying to the digital input port can generate a port interrupt. The analog input cannot generate any interrupt request.
Port Interrupts (including other external interrupt sources) can be used to wake up the CPU from the HALT or the STOP mode.
但我在测试程序时会发现上升沿同样能触发此中断,而且并不是每次都能触发.不知为何.应如何配置??? 我的程序就是一个按键.上电后程序进STOP,按键按下时通过此中断唤醒程序工作,再次按下程序再进STOP.相应程序见下面:
同样的问题在SH69P20这颗芯片中,使用PA0,PA3中断时,设置为下降沿触发,上升沿同样能触发!
//---------------中断初始化--------------------
LDI IRQ,0000B
LDI IE,0001B
NOP
STOP
NOP
MAIN: NOP
LDA STATE,0
BNZ RUN_PRG
LDA HOLD_CNT,0
BNZ RUN_PRG
LDI HOLD_CNT,HOLD_CNT_VAL
ANDIM PORTA,1011B
LDI IE,0001B
STOP
NOP
//-------------------------------------------------------
NOP
NOP
RUN_PRG: LDI IE,0100B
NOP
HALT
NOP
NOP
JMP MAIN
;============================================================
;PORT中断服务子程序
PINT_SVR: NOP
//---------------IO初始化----------------------
LDI PORTA,0000B
LDI PACR,0100B
LDI PPACR,0100B
LDI PORTB,0000B
LDI PBCR,0000B
LDI PPBCR,0000B
//---------------AD初始化----------------------
LDI ADCON,0000B
//---------------PWM初始化---------------------
LDI PWMCON,0000B
//---------------TIMER0 初始化-----------------
LDI TL0,03H
LDI TH0,08H
LDI TM0,0111B
//---------------中断初始化--------------------
LDI IRQ,0000B
LDI IE,0001B
//---------------寄存器初始化-----------------
LDI K1ST,00H
LDI K2CD,00H
LDI SUB_CNT_L,SUB_CNT_L_VAL
LDI SUB_CNT_H,SUB_CNT_H_VAL
LDI MY_CNT,MY_CNT_VAL
LDI HOLD_CNT,HOLD_CNT_VAL
LDI OUT_L_CNT,OUT_L_CNT_VAL
LDI OUT_H_CNT,OUT_H_CNT_VAL
LDI STATE,00H
LDI IE,0100B
LDI IRQ,00H
RTNI
NOP
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