參數(shù)資料
型號(hào)： S3P821A-TW
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP80
封裝： 12 X 12 MM, TQFP-80
文件頁(yè)數(shù)： 24/33頁(yè)
文件大小： 281K
代理商： S3P821A-TW
S3P821A OTP
S3C821A/P821A
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
P2.0
SDAT
8 (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.
P2.1
SCLK
9 (11)
I/O
Serial clock pin. Input only pin.
V
PP
TEST
14 (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)
RESET
17 (19)
I
Chip Initialization
V
DD1/VSS1
V
DD1/VSS1
10 (12)/11 (13)
–
Logic power supply pin. V
DD should be tied to + 5
V during programming.
NOTE: ( ) means 80 QFP package.
Table 20-2. Comparison of S3P821A and S3C821A Features
Characteristic
S3P821A
S3C821A
Program Memory
48-K byte EPROM
48-K byte mask ROM
Operating Voltage (V
DD)
2.0 V to 5.5 V
OTP Programming Mode
V
DD = 5 V, VPP (TEST) = 12.5 V
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 the S3P821A, 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
V
DD
VPP
(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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