hn58x2502fpie Renesas Electronics Corporation., hn58x2502fpie Datasheet - Page 11

• Manufacturer Part Number: hn58x2502fpie
• Description: Serial Peripheral Interface Electrically Erasable And Programmable Read Only Memory
• Manufacturer: Renesas Electronics Corporation.

HN58X2502I/HN58X2504I
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, Jul.05.2005, page 11 of 20
 Power-up
 WRDI instruction execution
 WRSR instruction completion
 WRITE instruction completion
 WRITE protect (W) is driven low
W
Q
C
D
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