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S3C9454B/F9454B
Table 15-1. Descriptions of Pins Used to Read/Write the Flash ROM
Main Chip
Pin Name
Pin Name
P0.1
SDA
P0.0
RESET, P1.2
V
/V
V
DD
SS
DD
Characteristic
Program memory
Operating voltage (V
DD
MTP programming mode
Pin configuration
EPROM programmability
OPERATING MODE CHARACTERISTICS
When 12.5 V is supplied to the V
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)
Table 15-2. Comparison of S3F9454B and S3C9454B Features
)
V
DD
20 DIP/20 SOP/20 SSOP/16 DIP/16SOP/16 SSOP/8 DIP/8 SOP
User Program multi time
pin of the S3F9454B Flash ROM programming mode is entered. The operating
PP
Table 15-3. Operating Mode Selection Criteria
REG/MEM
Address
(A15–A0)
0
0000H
0
0000H
0
0000H
1
0E3FH
During Programming
I/O
I/O
I
I
I
S3F9454B
4 Kbyte Flash ROM
2.0 V to 5.5 V
= 5 V, V
= 12.5 V
PP
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.
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
S3F9454B MTP
S3C9454B
Mode
15-3
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