Datasheet

© 2007 Microchip Technology Inc. DS39605F-page 59
PIC18F1220/1320
REGISTER 6-1: EECON1 REGISTER
R/W-x R/W-x U-0 R/W-0 R/W-x R/W-0 R/S-0 R/S-0
EEPGD CFGS — FREE WRERR WREN WR RD
bit 7 bit 0
bit 7 EEPGD: Flash Program or Data EEPROM Memory Select bit
1 = Access program Flash memory
0 = Access data EEPROM memory
bit 6 CFGS: Flash Program/Data EE or Configuration Select bit
1 = Access configuration registers
0 = Access program Flash or data EEPROM memory
bit 5 Unimplemented: Read as ‘0’
bit 4 FREE: Flash Row Erase Enable bit
1 = Erase the program memory row addressed by TBLPTR on the next WR command
(cleared by completion of erase operation – TBLPTR<5:0> are ignored)
0 = Perform write only
bit 3 WRERR: EEPROM Error Flag bit
1 = A write operation was prematurely terminated (any Reset during self-timed programming)
0 = The write operation completed normally
Note: When a WRERR occurs, the EEPGD and CFGS bits are not cleared. This allows
tracing of the error condition.
bit 2 WREN: Write Enable bit
1 = Allows erase or write cycles
0 = Inhibits erase or write cycles
bit 1 WR: Write Control bit
1 = Initiates a data EEPROM erase/write cycle or a program memory erase cycle or write cycle.
(The operation is self-timed and the bit is cleared by hardware once write is complete. The
WR bit can only be set (not cleared) in software.)
0 = Write cycle completed
bit 0 RD: Read Control bit
1 = Initiates a memory read
(Read takes one cycle. RD is cleared in hardware. The RD bit can only be set (not cleared)
in software. RD bit cannot be set when EEPGD = 1.)
0 = Read completed
Legend:
R = Readable bit S = Settable only U = Unimplemented bit, read as ‘0’
W = Writable bit -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared
x = Bit is unknown