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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: 46/64頁
文件大小: 603K
代理商: W921E840
W921E840
- 46 -
Erase Waveforms
D0 to D3
READ
Chip Erase
Erase Verify
T
EPW
T
RDS
T
DV
T
DF
T
DH
T
DS
D
OUT
PROG
High
PROGD / ERASE
Vpp (OSCI)
5V
14V
T
VPS
(for enternal mode)
T
VPH
7.4 Internal ROM -- EEPROM (Super EPROM) Program Method
The ROM of W921E840 is programmed on a page basis. Every page contains 128
×
10-bit of data. A
programming operation is the only way to change data from "1" to "0." To program the ROM,
addresses A0 to A12 must be latched and V
PP
= 12V, V
CC
= 5V,
READ
= V
IH
, and PROG = V
IL
.
Under these conditions, pulsing
PROGD ERASE
/
low starts the programming operation. Address A0
to A12 must be latched in the latch circuit for program verify operation to be performed correctly.
Program verify mode is entered when V
CC
= 5V, PROG = V
IH,
PROGD ERASE
V
IL
. The programming waveforms are shown below.
/
= V
IH,
and
READ
=
Programming Waveforms
A10 to A12
A0/D0 to A9/D9
LATCH
READ
Program Verify
Program
PROG
Max. 128 addresses x 10-bit
Address Stable
T
LPW
T
AH
T
AS
T
DS
T
DH
T
PUMP
T
PPW
T
DF
T
DV
D
IN
D
IN
D
OUT
//
//
//
//
//
//
PROGD / ERASE
Vpp (OSCI)
5V
12V
T
VPS
(for enternal mode)
//
Address Stable
Address Stable
Address Stable
Address Stable
Address Stable
T
VPH
T
PD
Note: If program range over one or more ROM pages, the
PROG
must return to high then go low again after another ROM
page address is latched.
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