PIC16F819T-E Datasheet, PDF (28/176 Pages) Microchip Technology – 18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology

PIC16F818/819
REGISTER 3-1:
EECON1: EEPROM ACCESS CONTROL REGISTER 1 (ADDRESS 18Ch)
R/W-x
U-0
U-0
R/W-x
R/W-x
R/W-0
R/S-0
EEPGD
—
—
FREE WRERR WREN
WR
bit 7
R/S-0
RD
bit 0
bit 7
bit 6-5
bit 4
bit 3
bit 2
bit 1
bit 0
EEPGD: Program/Data EEPROM Select bit
1 = Accesses program memory
0 = Accesses data memory
Reads ‘0’ after a POR; this bit cannot be changed while a write operation is in progress.
Unimplemented: Read as ‘0’
FREE: EEPROM Forced Row Erase bit
1 = Erase the program memory row addressed by EEADRH:EEADR on the next WR command
0 = Perform write-only
WRERR: EEPROM Error Flag bit
1 = A write operation is prematurely terminated (any MCLR or any WDT Reset during normal
operation)
0 = The write operation completed
WREN: EEPROM Write Enable bit
1 = Allows write cycles
0 = Inhibits write to the EEPROM
WR: Write Control bit
1 = 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.
0 = Write cycle to the EEPROM is complete
RD: Read Control bit
1 = Initiates an EEPROM read, RD is cleared in hardware. The RD bit can only be set (not
cleared) in software.
0 = Does not initiate an EEPROM read
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
S = Set only
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
x = Bit is unknown
DS39598E-page 26
 2004 Microchip Technology Inc.