X3100 datasheet(24/40 Pages) RENESAS

24 / 40 page

X3100, X3101

FN8110 Rev 1.00

Page 24 of 40

January 3, 2008

Write Enable/Write Disable (WREN/WRDI)

Any write to a nonvolatile array or register, requires the

WREN command be sent prior to the write command.

This command sets an internal latch allowing the write

operation to proceed. The WRDI command resets the

internal latch if the system decides to abort a write oper-

ation. See Figure 9.

Figure 9. EEPROM Write Enable Latch (WREN/WRDI) Operation Sequence

Table 30. X3100/X3101 Instruction Set

Instruction

Name

Instruction

Format*

Description

WREN

0000 0110

Set the write enable latch (write enable operation)—Figure 9

WRDI

0000 0100

Reset the write enable latch (write disable operation)—Figure 9

EEWRITE

0000 0010

Write command followed by address/data (4kbit EEPROM)—Figure 10, Figure 11

EEREAD STAT

0000 0101

Reads IDLock settings & status of EEPROM EEWRITE instruction—Figure 12

EEREAD

0000 0011

Read operation followed by address (for 4kbit EEPROM)—Figure 13

WCFIG

0000 1001

Write to configuration register followed by two bytes of data—Figure 2, Figure 14.

Data stored in SRAM only and will power-up to previous settings—Figure 1

WCNTR

0000 1010

Write to control register, followed by two bytes of data—Figure 15

RDSTAT

0000 1011

Read contents of status register—Figure 16

SET IDL

0000 0001

Set EEPROM ID lock partition followed by partition byte—Figure 17

*Instructions have the MSB in leftmost position and are transferred MSB first.

234

567

SCK

High Impedance

Instruction

(1 Byte)

WREN

WRDI

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