6.8 CONFIG8

Configuration Byte 8
Note:
  1. BBSIZE[7:0] bits can only be changed when BBEN = 1. Once BBEN = 0, BBSIZE[7:0] can only be changed through a Bulk Erase.
Name: CONFIG8
Offset: 30 0007h

Bit 76543210 
 BBSIZE[7:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 11111111 

Bits 7:0 – BBSIZE[7:0]  Boot Block Size Selection(1)

Table 6-2. Boot Block Size
BBEN BBSIZE End Address of Boot Block Boot Block Size (words)
PIC18Fx4Q20 PIC18Fx5Q20 PIC18Fx6Q20
1 xxxxxxxx N/A N/A
0 01111111 00 7FFFh N/A 16384
0 01111110 00 7EFFh N/A 16256
. . . . . . . . . . . .
0 01000000 00 40FFh N/A 8320
0 00111111 00 3FFFh N/A 8192
0 00111110 00 3EFFh N/A 8064
. . . . . . . . . . . .
0 00100000 00 20FFh N/A 4224
0 00011111 00 1FFFh 4096
0 00011110 00 1EFFh 3968
. . . . . . . . . . . .
0 00000011 00 03FFh 512
0 00000010 00 02FFh 384
0 00000001 00 01FFh 256
0 00000000 00 00FFh 128
BBSIZE[7:0] bits can only be changed when BBEN = 1. Once BBEN = 0, BBSIZE[7:0] can only be changed through a Bulk Erase.