參數(shù)資料
型號: W78L052A
廠商: WINBOND ELECTRONICS CORP
元件分類: 8位微控制器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁數(shù): 10/26頁
文件大?。?/td> 214K
代理商: W78L052A
W78LE52/W78L052A
- 10 -
6. ON-CHIP FLASH EPROM CHARACTERISTICS
The W78L052 has several modes to program the on-chip Flash EPROM. All these operations are
configured by the pins RST, ALE,
PSEN
, A9CTRL(P3.0), A13CTRL(P3.1), A14CTRL(P3.2),
OECTRL(P3.3),
CE
(P3.6),
OE
(P3.7), A0(P1.0) and V
PP
(
EA
). Moreover, the A15
A0(P2.7
P2.0,
P1.7
P1.0) and the D7
D0(P0.7
P0.0) serve as the address and data bus respectively for these
operations.
Read Operation
This operation is supported for customer to read their code and the Security bits. The data will not be
valid if the Lock bit is programmed to low.
Output Disable Condition
When the
OE
is set to high, no data output appears on the D7..D0.
Program Operation
This operation is used to program the data to Flash EPROM and the security bits. Program operation
is done when the V
PP
is reach to V
CP
(12.5V) level,
CE
set to low, and
OE
set to high.
Program Verify Operation
All the programming data must be checked after program operations. This operation should be
performed after each byte is programmed; it will ensure a substantial program margin.
Erase Operation
An erase operation is the only way to change data from 0 to 1. This operation will erase all the Flash
EPROM cells and the security bits from 0 to 1. This erase operation is done when the V
PP
is reach to
V
EP
level,
CE
set to low, and
OE
set to high.
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