8.5.7 CONFIG7

Configuration Byte 7
Note:
  1. Once protection is enabled through ICSP™ or a self-write, it can only be reset through a Bulk Erase.
  2. BBSIZE[2:0] bits can only be changed when BBEN = 1. Once BBEN = 0, BBSIZE[2:0] can only be changed through a Bulk Erase.
Name: CONFIG7
Address: 0x300006

Bit 76543210 
   DEBUGSAFENBBENBBSIZE[2:0] 
Access R/WR/WR/WR/WR/WR/W 
Reset 111111 

Bit 5 – DEBUG Debugger Enable

ValueDescription
1Background debugger disabled
0Background debugger enabled

Bit 4 – SAFEN  Storage Area Flash (SAF) Enable(1)

ValueDescription
1SAF is disabled
0SAF is enabled

Bit 3 – BBEN  Boot Block Enable(1)

ValueDescription
1Boot Block is disabled
0Boot Block is enabled

Bits 2:0 – BBSIZE[2:0]  Boot Block Size Selection(2)

Table 8-1. Boot Block Size
BBENBBSIZEEnd Address of Boot BlockBoot Block Size (words)
PIC18FX4Q40PIC18FX5Q40PIC18FX6Q40
1xxx——
011100 03FFh512
011000 07FFh1024
010100 0FFFh2048
010000 1FFFh4096
001100 3FFFh—8192
001000 7FFFh—16384
000100 FFFFh—
000001 FFFFh—
Once protection is enabled through ICSP™ or a self-write, it can only be reset through a Bulk Erase.BBSIZE[2:0] bits can only be changed when BBEN = 1. Once BBEN = 0, BBSIZE[2:0] can only be changed through a Bulk Erase.