8.5.8 CONFIG8

Configuration Byte 8

Note:

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
Address:	30 0007h


Bit	7	6	5	4	3	2	1	0
	BBSIZE[7:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	1	1	1	1	1	1	1	1

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

Table 8-1. Boot Block Size
BBEN	BBSIZE	End Address of Boot Block	Boot Block Size (words)
BBEN	BBSIZE	End Address of Boot Block	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.

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