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參數(shù)資料
型號(hào): W921E840
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-Bit Microcontroller(4位的微控制器)
中文描述: 4-BIT, EEPROM, 4 MHz, MICROCONTROLLER, PDIP40
封裝: DIP-40
文件頁(yè)數(shù): 44/64頁(yè)
文件大?。?/td> 603K
代理商: W921E840
W921E840
- 44 -
7.1 Pin Description of EEPROM Function, continued
SYMBOL
I/O
FUNCTION
NORMAL FUN.
A0/D0 to A3/D3
I/O
Address/data pins or mode selection pins
PA.0 to PA.3
A4/D4 to A7/D7
I/O
Address/data pins or mode selection pins
PB.0 to PB.3
V
PP
I
Program/erase power supply pin or mode selection
latch pin
OSCI
PROG
I
Program/erase select pin
OSCO
P3.3
PROGD / ERASE
I
Program/erase enable pin
READ
LATCH
I
Chip read enable pin
P6.2
I
Address latch enable pin
P6.3
RESET
V
DD
I
Reset input pin or mode selection enable pin
RESET
V
DD
I
Positive power supply input pin
V
SS
I
Negative power supply input pin
V
SS
7.2 EEPROM Program/Erase Mode Selection
EEPROM program/erase mode includes super EEPROM R/W mode, initial condition register INI1
R/W mode. The following diagram indicates the method of entering the EEPROM program/erase
mode. The
RESET
pin should be kept to high after mode selection.
EEPROM Program/Erase Mode Selection
RESET
A0/D0 to A3/D3
Selecting Data
A4/D4 to A7/D7
V
(OSCI)
PP
Selecting Data
Over 9V
Note: Latch at falling edge
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