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S3C9442/C9444/F9444/C9452/C9454/F9454
Table 15-1. Descriptions of Pins Used to Read/Write the Flash ROM
Main Chip
Pin Name
Pin Name
P0.1
SDA
P0.0
, P1.2
RESET
V
/V
V
DD
SS
DD
Table 15-2. Comparison of S3F9444/F9454 and S3C9442/C9444/C9452/C9454 Features
Characteristic
Program Memory
Operating Voltage (V
OTP Programming Mode
Pin Configuration
EPROM Programmability
OPERATING MODE CHARACTERISTICS
When 12.5 V is supplied to the V
operating mode (read, write, or read protection) is selected according to the input signals to the pins listed in
Table 15-3 below.
V
V
DD
PP
5 V
5 V
12.5 V
12.5 V
12.5 V
NOTE: "0" means Low level; "1" means High level.
Pin No.
18 (20-pin)
14 (16-pin)
SCL
19 (20-pin)
15 (16-pin)
V
4
PP
/V
20 (20-pin), 16 (16-pin)
SS
1 (20-pin), 1 (16-pin)
)
DD
V
DD
User Program multi time
pin of the S3F9444/F9454 Flash ROM programming mode is entered. The
PP
Table 15-3. Operating Mode Selection Criteria
REG/
Address
MEM
(A15–A0)
0
0000H
0
0000H
0
0000H
1
0E3FH
During Programming
I/O
I/O
I
I
I
S3F9444/F9454
4 Kbyte Flash ROM
2.0 V to 5.5 V
= 5 V, V
= 12.5 V
PP
20 DIP/20 SOP/16 DIP/8 DIP/8 SOP
R/W
1
0
1
0
Function
Serial data pin (output when reading, Input
when writing) Input and push-pull output port
can be assigned
Serial clock pin (input only pin)
Power supply pin for flash ROM cell writing
(indicates that MTP enters into the writing
mode). When 12.5 V is applied, MTP is in
writing mode and when 5 V is applied,
MTP is in reading mode. (Option)
Logic power supply pin.
S3C9442/C9444/C9452/C9454
2K/4K byte mask ROM
2.0 V to 5.5 V
Programmed at the factory
Flash ROM read
Flash ROM program
Flash ROM verify
Flash ROM read protection
S3F9444/F9454 MTP
Mode
15-3
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