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參數資料
型號: 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
文件頁數: 45/64頁
文件大小: 603K
代理商: W921E840
W921E840
Publication Publication Release Date: August 1997
- 45 - Revision A1
7.2 EEPROM Program/Erase Mode Selection, continued
SELECTING DATA
MODE
A7 to A4
A3 to A0
XD 0 0
XD 0 0
XD 0 0
XD 1 0
0 0 0 0
1 0 0 0
1 0 1 0
0 1 1 0
Normal mode was selected
Super EPROM (ROM code) mode was selected
I1 (INI1 register) mode was selected
Read body ID code mode was selected
Note: X
don't care
D = 1: *External program/erase voltage (V
PP
) was selected.
0: Internal program/erase voltage (V
PP
) was selected.
*: V
PP
= 12V for external program
V
PP
= 14V for external erase
7.3 Initial Condition Registers Program Method
There are 2
×
4-bit of the initial condition registers (not part of the RAM) in W921E840 to control the
micro-controller initial status after power-on. The format is described as following:
INI1 register:
(initial value = 0FH)
b3
b2
b1
b0
0: ROM code cannot be read out
1: ROM code can be read out
0: acts as as RC oscillator type
1: acts as crystal type
0: f1 = f , f2 = f
H
Reserved for user
(default as program flag of ROM code
0: already programmed, 1: not yet)
1: f1 = f , f2 = f
L
only for W921E841, 843, 844
Programming Waveforms
READ
PROG
D0 to D3
T
DS
T
PUMP
D
IN
T
PPW
T
DH
T
DV
T
DF
D
OUT
PROGD / ERASE
Vpp (OSCI)
5V
12V
T
VPS
(for enternal mode)
T
VPH
相關PDF資料
PDF描述
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