W742E Datasheet, PDF (38/60 Pages) Winbond – 4 BIT MICROCONTROLLER

W742E/C811
release or interrupt subroutine. Port status register 0 (PSR0) records the status of signal changes on
the pins of port RC. PSR0 can be read out and cleared by the MOVA R, PSR0, and CLR PSR0
instructions. In addition, the falling edge signal on the pin of port RC specified by the instruction MOV
SEF, #I will cause the device to exit the stop mode. Refer to Figure 5-14 and the instruction table for
more details.
PM0.2
RC.0
PM0.2
RC.1
PM0.2
RC.2
PM0.2
RC.3
DATA BUS
Signal
change
detector
PEF.0
Signal
change
detector
PEF.1
PEF.2
Signal
change
detector
Signal
change
detector
PEF.3
D
PSR0.0
Q
ck _R
D
Q
ck _R
PSR0.1
D
Q
ck _R
PSR0.2
D
Q
ck _R
PSR0.3
Falling
Edge
detector
Falling
Edge
detector
Falling
Edge
detector
Falling
Edge
detector
SEF.0
SEF.1
SEF.2
SEF.3
DQ
ck _R
EVF.2
HEF.2
IEF.2
HCF.2
INT 2
CLR EVF, #I
Reset
Reset
MOV PEF, #I
CLR PSR0
To Wake Up Stop Mode
Figure 5-14 Architecture of Input Ports RC
- 38 -