PD17225_15 Datasheet, PDF (28/86 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

µPD17225, 17226, 17227, 17228
3.6 INT Pin
This pin inputs an external interrupt request signal. At either the rising or falling edge of the signal input to this pin, the
IRQ flag (RF: address 3EH, bit 0) is set.
The status of this pin can be read by using the INT flag (RF: address 0FH, bit 0). When the high level is input to the
pin, the INT flag is set to “1”; when the low level is input, the flag is reset to “0” (refer to 7.2.1 INT).
Figure 3-1. Relations between Port Register and Each Pin
Bank Address Port
Bit
b 3 P0A 3
Contents to Be Read Contents to Be Written
Output Form
Input Mode Output Mode Input Mode Output Mode
On Reset
b 2 P0A 2
70H Port 0A
b 1 P0A 1
b 0 P0A 0
Input only Pin status
–
b 3 P0B 3
–
–
Input mode
(w/pull-up resistor)
b 2 P0B 2
71H Port 0B
b 1 P0B 1
b 0 P0B 0
b 3 P0C 3
b 2 P0C 2
0 72H Port 0C
b 1 P0C 1
b 0 P0C 0
N-ch
open-drain
–
b3 P0D 3 ^{(Output only)}
–
Output mode
(Low level output)
b 2 P0D 2
73H Port 0D
b 1 P0D 1
Output
latch
Output
latch
b 0 P0D 0
b 3 P0E 3
6FH
b 2 P0E 2
Port 0E
b 1 P0E 1
COMS
push-pull
Pin status
Output
latch
Input mode
(w/pull-up resistor)
b 0 P0E 0
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Data Sheet U12643EJ2V0DS00