µPD17P236

10

Data Sheet U14776EJ1V0DS00

2.1 Normal Operation Mode (2/2)

Pin No.

Symbol

Function

Output Format

At Reset

23 (24)

These pins constitute a 4-bit I/O port that can be set in the input or

N-ch

Low-level

24 (25)

output mode in 4-bit units (group I/O).

open-drain

output

25 (26)

In the input mode, these pins are CMOS input pins with a pull-up

26 (27)

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.

(15)

IC1

These pins cannot be used.

–

–

(30)

IC2

Leave open.

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.

Symbol

Function

Output Format

At Reset

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.

11

CLK

Inputs clock for PROM programming.

–

–

12

GND

Ground.

–

–

19 (20)

Input pins used to select operation mode when PROM is

–

Input



programmed.

22 (23)

23 (24)

Input/output 8-bit data for PROM programming

CMOS

Input



push-pull

26 (27)

27 (28)

28 (29)

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.