
Preliminary W77IE58
Publication Release Date: July 2000
- 77 -
Revision A1
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
ROM 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.
Erase Verify Operation
After an erase operation, all of the bytes in the chip must be verified to check whether they have been
successfully erased to 1 or not. The erase verify operation automatically ensures a substantial erase
margin. This operation will be done after the erase operation if V
PP
= V
EP
(14.5V),
CE
is high and
OE
is low.
Program/Erase Inhibit Operation
This operation allows parallel erasing or programming of multiple chips with different data. When
P3.6(
CE
) = V
IH
, P3.7(
OE
) = V
IH
, erasing or programming of non-targeted chips is inhibited. So, except
for the P3.6 and P3.7 pins, the individual chips may have common inputs.
Company/Device ID Read Operation
This operation is supported for FLASH ROM programmer to get the company ID or device ID on the
W77IE58.
Operations
P3.0
(A9
CTRL)
0
0
0
0
1
P3.1
(A13
CTRL)
0
0
0
0
0
P3.2
(A14
CTRL)
0
0
0
0
0
P3.3
(OE
CTRL)
0
0
0
0
0
P3.6
(
CE
)
P3.7
(
OE
)
EA
(V
PP
)
P2,P1
(A15..A0)
P0
(D7..D0)
Note
Read
Output Disable
Program
Program Verify
Erase
0
0
0
1
0
0
1
1
0
1
1
1
Address
X
Address
Address
A0:0,
others: X
Address
X
Data Out
Hi-Z
Data In
Data Out
Data In
0FFH
Data Out
X
V
CP
V
CP
V
EP
@3
@4
Erase Verify
Program/Erase
Inhibit
Company ID
Device ID
1
X
0
0
0
0
0
0
1
1
0
1
V
EP
V
CP
/
V
EP
1
1
@5
1
1
0
0
0
0
0
0
0
0
0
0
A0 = 0
A0 = 1
Data Out
Data Out
Notes:
1. All these operations happen in RST = V
IH
, ALE = V
IL
and
PSEN
= V
IH
.
2. V
CP
= 12.5V, V
EP
= 14.5V, V
IH
= V
DD
, V
IL
= V
SS
.
3. The program verify operation follows behind the program operation.
4. This erase operation will erase all the on-chip ROM cells and the Security bits.