HN58X2508TIE RENESAS [Renesas Technology Corp], HN58X2508TIE Datasheet - Page 15

• Manufacturer Part Number: HN58X2508TIE
• Description: Electrically Erasable and Programmable Read Only Memory
• Manufacturer: RENESAS [Renesas Technology Corp]

HN58X2508I/HN58X2516I
Write Disable (WRDI):
One way of resetting the Write Enable Latch (WEL) bit is to send a Write Disable instruction to the device.
As shown in the following figure, to send this instruction to the device, chip select (S) is driven low, and the
bits of the instruction byte are shifted in, on serial data input (D).
The device then enters a wait state. It waits for the device to be deselected, by chip select (S) being driven
high. The Write Enable Latch (WEL) bit, in fact, becomes reset by any of the following events:
Write Disable (WRDI) Sequence
Rev.2.00, Aug.19.2004, page 15 of 27
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Power-up
WRDI instruction execution
WRSR instruction completion
WRITE instruction completion
W
C
D
Q
S
V
V
V
V
V
V
V
V
IH
IL
IH
IL
IH
IL
IH
IL
0
1
2
Instruction
High-Z
3
4
5
6
7