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Z51F6412
Product Specification
PS030302-0212
P R E L I M I N A R Y
183
Pin count
80
64
Max I/O
66
52
Difference
(removed functions
on standard Z51F6412)
- P6[4:7]
(EC4,5)*
- P7[0:7]
(PCI7)
- P8[0:1]
Notice *) Timer4,5 can not only use External clock input source mode.
C. LFP example circuit
D. 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 an
y error by using compare jump instructions.
If input signal is fixed, there is no error in using compare jump instructions.
Error status example
180k
1000pF
250pF
LPF
Layout circuit near to MCU
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