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S3C8245/P8245/C8249/P8249 S3P8245/P8249 OTP
21-3
Table 21-1. Descriptions of Pins Used to Read/Write the EPROM
Main Chip During Programming
Pin Name Pin Name Pin No. I/O Function
P3.3 SDAT 10 I/O Serial data pin. Output port when reading and input
port when writing. Can be assigned as a
Input/push-pull output port.
P3.4 SCLK 11 I Serial clock pin. Input only pin.
V
PP
TEST 16 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 19 I Chip Initialization
V
DD
/V
SS
V
DD
/V
SS
12/13 – Logic power supply pin. V
DD
should be tied to
+5 V during programming.
Table 21-2. Comparison of S3P8245/P8249 and S3C8245/C8249 Features
Characteristic S3P8245/P8249 S3C8245/C8249
Program Memory 16K/32K-byte EPROM 16K/32K-byte mask ROM
Operating Voltage (V
DD
) 1.8 V to 5.5 V 1.8 V to 5.5 V
OTP Programming Mode V
DD
= 5 V, V
PP
(TEST) = 12.5 V
Pin Configuration 80-QFP/80-TQFP 80-QFP/80-TQFP
EPROM Programmability User Program 1 time Programmed at the factory