Datasheet

PIC18F6585/8585/6680/8680
DS30491D-page 92  2003-2013 Microchip Technology Inc.
5.5.2 WRITE VERIFY
Depending on the application, good programming
practice may dictate that the value written to the mem-
ory should be verified against the original value. This
should be used in applications where excessive writes
can stress bits near the specification limit.
5.5.3 UNEXPECTED TERMINATION OF
WRITE OPERATION
If a write is terminated by an unplanned event, such as
loss of power or an unexpected Reset, the memory
location just programmed should be verified and repro-
grammed if needed. The WRERR bit is set when a
write operation is interrupted by a MCLR
Reset or a
WDT Time-out Reset during normal operation. In these
situations, users can check the WRERR bit and rewrite
the location.
5.5.4 PROTECTION AGAINST SPURIOUS
WRITES
To protect against spurious writes to Flash program
memory, the write initiate sequence must also be
followed. See Section 24.0 “Special Features of the
CPU” for more detail.
5.6 Flash Program Operation During
Code Protection
See Section 24.0 “Special Features of the CPU” for
details on code protection of Flash program memory.
TABLE 5-2: REGISTERS ASSOCIATED WITH PROGRAM FLASH MEMORY
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value on:
POR, BOR
Value on
all other
Resets
TBLPTRU
— — bit 21 Program Memory Table Pointer Upper Byte
(TBLPTR<20:16>)
--00 0000 --00 0000
TBPLTRH Program Memory Table Pointer High Byte (TBLPTR<15:8>) 0000 0000 0000 0000
TBLPTRL Program Memory Table Pointer High Byte (TBLPTR<7:0>) 0000 0000 0000 0000
TABLAT Program Memory Table Latch 0000 0000 0000 0000
INTCON GIE/GIEH PEIE/GIEL
TMR0IE INTE RBIE TMR0IF INTF RBIF 0000 0000 0000 0000
EECON2 EEPROM Control Register 2 (not a physical register) — —
EECON1 EEPGD CFGS
— FREE WRERR WREN WR RD xx-0 x000 uu-0 u000
IPR2
— CMIP —EEIPBCLIP LVDIP TMR3IP CCP2IP -1-1 1111 -1-1 1111
PIR2
— CMIF —EEIFBCLIF LVDIF TMR3IF CCP2IF -0-0 0000 -0-0 0000
PIE2
— CMIE —EEIEBCLIE LVDIE TMR3IE CCP2IE -0-0 0000 -0-0 0000
Legend: x = unknown, u = unchanged, r = reserved, – = unimplemented, read as ‘0’.
Shaded cells are not used during Flash/EEPROM access.
18F8680.book Page 92 Tuesday, January 29, 2013 1:32 PM