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| 型號： | UPD17243MC-xxx-5A4 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片微控制器的小型通用兩用紅外遙控遞質(zhì) |
| 文件頁數(shù)： | 37/102頁 |
| 文件大小： | 461K |
| 代理商： | UPD17243MC-XXX-5A4 |
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37
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
3.8
INT Pin
The INT pin functions alternately as the P1B
0
pin. To use the INT pin, set INTSEL (bit 1 of address 1FH) of the
register file to 1.
This pin inputs an external interrupt request signal. The IRQ flag (RF: bit 0 of address 3EH) is set at either the
rising or falling edge of the signal input to this pin.
The status of this pin can be read by using the INT flag (RF: bit 0 of address 0FH). When a high level is input to
the pin, the INT flag is set to “1”; when a low level is input, the flag is reset to “0” (refer to
8.2.1 INT
).
Table 3-1. Relationship Between Port Register and Each Pin
Bank Address
Target Port
Bit
Output
Format
Read Contents
Written Contents
After Reset
Input mode Output mode Input mode Output mode
0
70H
Port 0A
b
3
P0A3
Input
Pin status
–
–
–
Input mode
(with pull-up
resistor)
b
2
P0A2
b
1
P0A1
b
0
P0A0
71H
Port 0B
b
3
P0B3
N-ch
open drain
Output latch Output latch Output latch
b
2
P0B2
b
1
P0B1
b
0
P0B0
72H
Port 0C
b
3
P0C3
Output mode
(low-level
output)
b
2
P0C2
b
1
P0C1
b
0
P0C0
73H
Port 0D
b
3
P0D3
b
2
P0D2
b
1
P0D1
b
0
P0D0
6FH
Port 0E
b
3
P0E3
CMOS
push-pull
or N-ch
open drain
b
2
P0E2
b
1
P0E1
b
0
P0E0
1
70H
Port 1A
b
2
P1A2
CMOS
push-pull
or N-ch
open drain
b
1
P1A1
b
0
P1A0
71H
Port 1B
b
0
P1B0
Input
–
–
–
Input mode
(when key
matrix not
used and no
resistor
connected)
Input mode
(when key
matrix not
used and no
pull-up resistor
connected)
Input mode
(when key
matrix not
used and no
resistor
connected)
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