8.5.7 Configuration Byte 7

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:	CONFIG7
Offset:	0x300006


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
Value	Condition	Description
		End Address of Boot Block	Boot Block Size (words)
		End Address of Boot Block	PIC18FX4Q35	PIC18FX5Q35	PIC18FX6Q35
`xxxxxxxx`	BBEN = `1`	N/A	N/A
`01111111`	BBEN = `0`	00 7FFFh	N/A	16384
`01111110`	BBEN = `0`	00 7EFFh	N/A	16256
. . .	. . .	. . .	. . .
`01000000`	BBEN = `0`	00 40FFh	N/A	8320
`00111111`	BBEN = `0`	00 3FFFh	8192
`00111110`	BBEN = `0`	00 3EFFh	8064
. . .	. . .	. . .	. . .
`00100000`	BBEN = `0`	00 20FFh	4224
`00011111`	BBEN = `0`	00 1FFFh	4096
`00011110`	BBEN = `0`	00 1EFFh	3968
. . .	. . .	. . .	. . .
`00000011`	BBEN = `0`	00 03FFh	512
`00000010`	BBEN = `0`	00 02FFh	384
`00000001`	BBEN = `0`	00 01FFh	256
`00000000`	BBEN = `0`	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.

DS40002671A

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