MC96F6432
June 22, 2018 Ver. 2.9
321
B. Instructions on how to use the input port.
Error occur status
Using compare jump instructions with input port, it could cause error due to the timing conflict inside the
MCU.
Compare jump Instructions which cause potential error used with input port condition:
JB
bit, rel
; jump on direct bit=1
JNB
bit, rel
; jump on direct bit=0
JBC
bit, rel
; jump on direct bit=1 and clear
CJNE A, dir, rel ; compare A, direct jne relative
DJNZ dir, rel
; decrement direct byte, jnz relative
It is only related with Input port. Internal parameters, SFRs and output bit ports don
’t cause any error by
using compare jump instructions.
If input signal is fixed, there is no error in using compare jump instructions.
Error status example
Preventative measures (2 cases)
Do not use input bit port for bit operation but for byte operation. Using byte operation instead of bit oper
ation will not cause any error in using compare jump instructions for input port.
while(1){
if (P00==1)
{ P10=1; }
else { P10=0; }
P11^=1;
}
zzz:
JNB 080.0, xxx ; it possible to be error
SETB 088.0
SJMP yyy
xxx: CLR 088.0
yyy: MOV C,088.1
CPL C
MOV 088.1,C
SJMP zzz
unsigned char ret_bit_err(void)
{
return
!P00
;
}
MOV R7, #000
JB 080.0, xxx ; it possible to be error
MOV R7, #001
xxx: RET
while(1){
if ((P0&0x01)==0x01)
{ P10=1; }
else { P10=0; }
P11^=1;
}
zzz:
MOV A, 080 ; read as byte
JNB 0E0.0, xxx ; compare
SETB 088.0
SJMP yyy
xxx: CLR 088.0
yyy: MOV C,088.1
CPL C
MOV 088.1,C
SJMP zzz
Summary of Contents for MC96F6432 Series
Page 24: ...MC96F6432 24 June 22 2018 Ver 2 9 4 Package Diagram Figure 4 1 48 Pin LQFP 0707 Package...
Page 25: ...MC96F6432 June 22 2018 Ver 2 9 25 Figure 4 2 44 Pin MQFP Package...
Page 26: ...MC96F6432 26 June 22 2018 Ver 2 9 Figure 4 3 32 Pin LQFP Package...
Page 27: ...MC96F6432 June 22 2018 Ver 2 9 27 Figure 4 4 32 Pin SOP Package...
Page 28: ...MC96F6432 28 June 22 2018 Ver 2 9 Figure 4 5 28 Pin SOP Package...
