S3C9654/C9658/P9658

S3P9658 OTP

17-3

Table 17-1. Descriptions of Pins Used to Read/Write the EPROM

Main Chip

During Programming

Pin Name

Pin Name

Pin Number (20 DIP)

I/O

Function

P1.0

SDAT

5

I/O

Serial Data Pin (Output when reading, Input when

writing) Input and Push-pull Output Port can be

assigned

P1.1

SCLK

4

I/O

Serial Clock Pin (Input Only Pin)

RESET

RESET

16

I

0 V : OTP write and test mode

5 V : Operating mode

TEST

V

PP

(TEST)

13

I

Chip Initialization and EPROM Cell Writing Power

Supply Pin (Indicates OTP Mode Entering) When

writing 12.5 V is applied and when reading.

V

V

19/2

I

Logic Power Supply Pin.

Table 17-2. Comparison of S3P9658 and S3C9654/C9658 Features

Characteristic

S3P9658

S3C9654/C9658

Program Memory

8 K-byte EPROM

4/8 K-byte mask ROM

Operating Voltage (V

4.0 V to 5.25 V

4.0 V to 5.25 V

OTP Programming Mode

V

Pin Configuration

20/18/16 DIP, 20/18/16 SOP

20/18/16 DIP, 20/18/16 SOP, 16SSOP

EPROM Programmability

User Program 1 time

Programmed at the factory

OPERATING MODE CHARACTERISTICS

RESET) pin of the S3P9658, the EPROM programming mode is entered.

The operating mode (read, write, or read protection) is selected according to the input signals to the pins listed in

Table 14-3 below.

Table 17-3. Operating Mode Selection Criteria

V

DD

V

RESET)

REG/

MEM

MEM

Address (A15-A0)

R/W

Mode

5 V

5 V

0

0000H

1

EPROM read

12.5 V

0

0000H

0

EPROM program

12.5 V

0

0000H

1

EPROM verify

12.5 V

1

0E3FH

0

EPROM read protection

NOTE: "0" means Low level; "1" means High level.