
2007 Microchip Technology Inc.
DS39599G-page 73
PIC18F2220/2320/4220/4320
REGISTER 6-1:
EECON1: DATA EEPROM CONTROL REGISTER 1
R/W-x
U-0
R/W-0
R/W-x
R/W-0
R/S-0
EEPGD
CFGS
—
FREE
WRERR(1)
WREN
WR
RD
bit 7
bit 0
Legend:
S = Settable bit
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
bit 7
EEPGD: Flash Program or Data EEPROM Memory Select bit
1 = Access Flash program memory
0 = Access data EEPROM memory
bit 6
CFGS: Flash Program/Data EEPROM or Configuration Select bit
1 = Access Configuration registers
0 = Access Flash program 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)
0 = Perform write-only
bit 3
WRERR: EEPROM Error Flag bit(1)
1 = A write operation was prematurely terminated (any Reset during self-timed programming)
0 = The write operation completed normally
bit 2
WREN: Write Enable bit
1 = Allows write cycles to Flash program/data EEPROM
0 = Inhibits write cycles to Flash program/data EEPROM
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
Note 1:
When a WRERR occurs, the EEPGD and CFGS bits are not cleared. This allows tracing of the error
condition.