HN58X25128I Renesas Technology, HN58X25128I Datasheet - Page 17

• Manufacturer Part Number: HN58X25128I
• Description: (HN58X25128I / HN58X25256I) EEPROM
• Manufacturer: Renesas Technology

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
 Power-up
 WRDI instruction execution
 WRSR instruction completion
 WRITE instruction completion
9
Q
C
D
5
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
HN58X25128I/HN58X25256I
6
7
Rev.0.0, Nov. 2002, page 15 of 27