Samsung S3C84E5 user manual Operating Mode Characteristics, Reg, Test MEM

S3C84E5/C84E9/P84E9 OTP VERSION

Table 19-1. Descriptions of Pins Used to Read/Write the OTP

	Main Chip			During Programming
	Pin Name
		Pin Name	Pin No.	I/O	Function
	P4.3	SDAT	9(3)	I/O	Serial data pin. Output port when reading and
					input port when writing. Can be assigned as a
					input or push-pull output port.
	P4.2	SCLK	10(4)	I	Serial clock pin. Input only pin.
	TEST	VPP	15(9)	I	Power supply pin for EPROM cell writing (indicates
					that OTP enters into the writing mode).
					When 12.5 V is applied, OTP is in writing mode
					and when 5 V is applied, OTP is in reading mode.
					(Option)
	nRESET	nRESET	18(12)	I	Chip Initialization
	VDD/VSS	VDD/VSS	11(12)/5(6)	–	Logic power supply pin. VDD should be tied to +5 V
					during programming.
NOTE: ( ) means 44 QFP package.

Table 19-2. Comparison of S3P84E9 and S3C84E5/C84E9 Features

Characteristic	S3P84E9	S3C84E5/C84E9
Program memory	32K-byte EPROM	16/32K-byte mask ROM
Operating voltage (VDD)	VLVR to 5.5 V	VLVR to 5.5 V
OTP programming mode	VDD = 5 V, VPP (TEST) = 12.5 V
Pin configuration	42-SDIP/44-QFP	42-SDIP/44-QFP
EPROM programmability	User Program 1 time by programmer	Programmed at the factory

OPERATING MODE CHARACTERISTICS

When 12.5 V is supplied to the VPP (TEST) pin of the S3P84E9, 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 19-3 below.

Table 19-3. Operating Mode Selection Criteria

VDD	VPP	REG/	Address	R/W
	(TEST)	MEM	(A14–A0)
5 V	5 V	0	xxxxH	1
	12.5 V	0	xxxxH	0
	12.5 V	0	xxxxH	1
	12.5 V	1	0E3FH	0

Mode

EPROM read EPROM program EPROM verify EPROM read protection

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

19-3