hn58x25128fpie Renesas Electronics Corporation., hn58x25128fpie Datasheet - Page 10

• Manufacturer Part Number: hn58x25128fpie
• Description: Serial Peripheral Interface 128k Eeprom 16-kword ?? 8-bit 256k Eeprom 32-kword ?? 8-bit Electrically Erasable And Programmable Read Only Memory
• Manufacturer: Renesas Electronics Corporation.

HN58X25128I/HN58X25256I
Write Enable (WREN):
The Write Enable Latch (WEL) bit must be set prior to each WRITE and WRSR instruction. The only way to do this is
to send a Write Enable 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.
Write Enable (WREN) Sequence
Rev.3.00, Jul.06.2005, page 10 of 20
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