程序中：lcd_data_num和lcd_data_head是什么作用？是确定LCD数据在00H-1FH的中位置吗？可是mov a,@0 mov lcd_address,a 这两句不是LCD地址清0吗，也就是说数据从00H开始存放。我晕了，我理解不对吗？
;================================================
;=========== lcd display macro ===================
;================================================
lcd_display macro bank_lcd,lcd_data_head,lcd_data_num
bank bank_lcd
mov a,@lcd_data_num ；
mov lcd_data_head,a
mov a,@0
mov lcd_address,a
mov a,@lcd_data_head＋1
mov r4,a
bank bank_lcd
$display_next:
mov a,r0 ;get data
mov lcd_data,a
inc lcd_address
swapa r0
mov lcd_data,a
inc lcd_address
inc r4
djz lcd_data_head
jmp $display_next
bs lcd_control,lcden ;enable lcd
nop
endm |
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