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参数资料
| 型号： | S3P8454-TW |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 25 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 12 X 12 MM, TQFP-80 |
| 文件页数： | 24/32页 |
| 文件大小： | 206K |
| 代理商： | S3P8454-TW |
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S3P8454 OTP
S3C8454/P8454
20-4
Table 20-1. Descriptions of Pins Used to Read/Write the EPROM
Main Chip
During Programming
Pin Name
Pin No.
I/O
Function
P4.5
SDAT
10
I/O
Serial data pin (Output when reading, Input when
writing) Input and push-pull output port can be assigned.
P4.4
SCLK
11
I
Serial clock pin (Input only pin)
EA
V
PP
16
I
EPROM cell writing power supply pin (Indicates OTP
mode entering) When writing 12.5 V is applied and
when reading 5 V is applied (Option).
RESET
19
I
Chip Initialization
V
DD1/VSS1
V
DD/VSS
12/13
I
Logic Power Supply Pin. V
DD should be tied to 5 V
during programming.
Table 20-2. Comparison of S3P8454 and S3C8454 Features
Characteristic
S3P8454
S3C8454
Program Memory
4 Kbyte EPROM
4 Kbytes mask ROM
Operating Voltage (V
DD)
2.7 V to 5.5 V
2.7 V to 5.5V
OTP Programming Mode
V
DD = 5 V, VPP (TEST) = 12.5V
Pin Configuration
80 QFP, 80 TQFP
EPROM Programmability
User Program 1 time
Programmed at the factory
OPERATING MODE CHARACTERISTICS
When 12.5 V is supplied to the V
PP (TEST) pin of S3P8454, 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 20-3 below.
Table 20-3. Operating Mode Selection Criteria
VDD
V
PP
(TEST)
REG
/MEM
Address
(A15–A0)
R/W
Mode
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.
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