PIC16F877A-I/P【PDF 165/234 页】IC MCU FLASH 8KX14 EE 40DIP

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Sheet目录3827

161页 162页 163页 164页 [165页]166页 167页 168页 169页

PIC16F87XA

DS39582B-page 34

2003 Microchip Technology Inc.

REGISTER 3-1:

EECON1 REGISTER (ADDRESS 18Ch)

R/W-x

U-0

R/W-x

R/W-0

R/S-0

EEPGD

—

WRERR

WREN

bit 7

bit 0

bit 7

EEPGD: Program/Data EEPROM Select bit

= Accesses program memory

= Accesses data memory

Reads ‘0’ after a POR; this bit cannot be changed while a write operation is in progress.

bit 6-4

Unimplemented: Read as ‘0’

bit 3

WRERR: EEPROM Error Flag bit

= A write operation is prematurely terminated (any MCLR or any WDT Reset during normal

operation)

= The write operation completed

bit 2

WREN: EEPROM Write Enable bit

= Allows write cycles

= Inhibits write to the EEPROM

bit 1

WR: Write Control bit

= Initiates a write cycle. The bit is cleared by hardware once write is complete. The WR bit

can only be set (not cleared) in software.

= Write cycle to the EEPROM is complete

bit 0

RD: Read Control bit

= Initiates an EEPROM read; RD is cleared in hardware. The RD bit can only be set (not

cleared) in software.

= Does not initiate an EEPROM read

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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