upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 37

• Manufacturer Part Number: upd17240
• Description: 4-bit Single-chip Microcontrollers For Small General-purpose Infrared Remote Control Transmitters
• Manufacturer: Renesas Electronics Corporation.

3.8
register file to 1.
rising or falling edge of the signal input to this pin.
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).
Bank Address
0
1
The INT pin functions alternately as the P1B
This pin inputs an external interrupt request signal. The IRQ flag (RF: bit 0 of address 3EH) is set at either the
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
INT Pin
70H
71H
72H
73H
6FH
70H
71H
Port 0A
Port 0B
Port 0C
Port 0D
Port 0E
Port 1A
Port 1B
Target Port
Table 3-1. Relationship Between Port Register and Each Pin
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
3
2
1
0
3
2
1
0
3
2
1
0
3
2
1
0
3
2
1
0
2
1
0
0
Bit
P0C3
P0C2
P0C1
P0C0
P0D3
P0D2
P0D1
P0D0
P0A3
P0A2
P0A1
P0A0
P0B3
P0B2
P0B1
P0B0
P0E3
P0E2
P0E1
P0E0
P1A2
P1A1
P1A0
P1B0
Input
N-ch
open drain
CMOS
push-pull
or N-ch
open drain
CMOS
push-pull
or N-ch
open drain
Input
Format
Output
Data Sheet U15002EJ1V1DS
0
pin. To use the INT pin, set INTSEL (bit 1 of address 1FH) of the
Input mode Output mode Input mode Output mode
Pin status
Read Contents
Output latch Output latch Output latch
–
–
Written Contents
–
–
–
–
Input mode
(with pull-up
resistor)
Output mode
(low-level
output)
Input mode
(when key
matrix not
used and no
pull-up resistor
connected)
Input mode
(when key
matrix not
used and no
resistor
connected)
Input mode
(when key
matrix not
used and no
resistor
connected)
After Reset
37