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R1EX25032ASA00I Datasheet(PDF) 9 Page - Renesas Technology Corp

Part # R1EX25032ASA00I
Description  Serial Peripheral Interface Electrically Erasable and Programmable Read Only Memory
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R1EX25032ASA00I Datasheet(HTML) 9 Page - Renesas Technology Corp

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R1EX25032Axx00I/R1EX25064Axx00I
REJ03C0362-0001. Rev.0.01 Feb.21.2008
Functional Description
Status Register
The following figure shows the Status Register Format. The Status Register contains a number of status and control
bits that can be read or set (as appropriate) by specific instructions.
Status Register Format
SRWD
0
0
0
BP1
BP0
WEL
WIP
b7
Status Register Write Disable
Block Protect Bits
Write Enable Latch Bits
Write In Progress Bits
b0
WIP bit: The Write In Progress (WIP) bit indicates whether the memory is busy with a Write or Write Status Register
cycle.
WEL bit: The Write Enable Latch (WEL) bit indicates the status of the internal Write Enable Latch.
BP1, BP0 bits: The Block Protect (BP1, BP0) bits are non-volatile. They define the size of the area to be software
protected against Write instructions.
SRWD bit: The Status Register Write Disable (SRWD) bit is operated in conjunction with the write protect (
W) signal.
The Status Register Write Disable (SRWD) bit and write protect (
W) signal allow the device to be put in the Hardware
Protected mode. In this mode, the non-volatile bits of the Status Register (SRWD, BP1, BP0) become read-only bits.
Instructions
Each instruction starts with a single-byte code, as summarized in the following table. If an invalid instruction is sent
(one not contained in the following table), the device automatically deselects itself.
Instruction Set
Instruction
Description
Instruction Format
WREN
Write Enable
0000 0110
WRDI
Write Disable
0000 0100
RDSR
Read Status Register
0000 0101
WRSR
Write Status Register
0000 0001
READ
Read from Memory Array
0000 0011
WRITE
Write to Memory Array
0000 0010
page 9 of 20


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