UPD17P236 Datasheet, PDF (10/32 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROLLER

µPD17P236
2.1 Normal Operation Mode (2/2)
Pin No.
23 (24)
24 (25)
25 (26)
26 (27)
Symbol
P0C0
P0C1
P0C2
P0C3
(15)
IC1
(30)
IC2
Function
Output Format
These pins constitute a 4-bit I/O port that can be set in the input or
output mode in 4-bit units (group I/O).
In the input mode, these pins are CMOS input pins with a pull-up
resistor, and can be used as the key return input lines of a key
matrix. The standby status is released when at least one of these
pins goes low.
In the output mode, they serve as N-ch open-drain output pins and
can be used as the output lines of a key matrix.
N-ch
open-drain
These pins cannot be used.
–
Leave open.
At Reset
Low-level
output
–
Remark The number in parenthesis in the Pin No. column indicates the pin numbers of the 30-pin plastic SSOP.
2.2 PROM Programming Mode
Pin No.
3
9
11
12
19 (20)

22 (23)
23 (24)

26 (27)
27 (28)
28 (29)
1
2
Symbol
VPP
VDD
CLK
GND
MD0

MD3
D4

D7
D0
D1
D2
D3
Function
Power supply for PROM programming.
Apply +12.5 V to this pin as the program voltage when writing/
verifying program memory.
Power supply. Apply +6 V to this pin when writing/verifying
program memory.
Inputs clock for PROM programming.
Ground.
Input pins used to select operation mode when PROM is
programmed.
Output Format
–
At Reset
–
–
–
–
–
–
–
–
Input
Input/output 8-bit data for PROM programming
CMOS
push-pull
Input
Remarks 1. The other pins are not used in the PROM programming mode. How to handle the other opins are
described in PIN CONFIGURATION (2) PROM programming mode.
2. The number in parenthesis in the Pin No. column indicates the pin numbers of the 30-pin plastic
SSOP.
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Data Sheet U14776EJ1V0DS00