6.8 CONFIG8

Configuration Byte 8

Note:

When SAFLOCK = 0, once a SAFSZ bit is programmed to 0 through ICSP or a self-write, it can never be erased to a ‘1’, not even through a Bulk Erase.
When SAFLOCK = 1, once a SAFSZ bit is programmed to 0 through ICSP or a self-write, it can only be reset though a Bulk Erase.

Name:	CONFIG8
Offset:	0x300019


Bit	7	6	5	4	3	2	1	0
	SAFSZ[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 – SAFSZ[7:0] Storage Area Flash (SAF) Block Size Selection⁽¹⁾⁽²⁾

Table 6-3. SAF Block Size
WRTSAF	SAFLOCK	SAFSZ[7:0]	Size of SAF Block			SAF Bulk Erase	SAF Self-write
WRTSAF	SAFLOCK	SAFSZ[7:0]	PIC18Fx4Q24	PIC18Fx5Q24	PIC18Fx6Q24	SAF Bulk Erase	SAF Self-write
`1`	`1`	`1111 1111`	Storage Area Flash disabled			Yes	Yes
`1`	`1`	`1111 1110`	Last 128 words of PFM			Yes	Yes
`1`	`1`	`1111 110x`	Last 256 words of PFM			Yes	Yes
`1`	`1`	`1111 10xx`	Last 384 words of PFM			Yes	Yes
`1`	`1`	`1111 0xxx`	Last 512 words of PFM			Yes	Yes
`1`	`1`	`1110 xxxx`	Last 640 words of PFM			Yes	Yes
`1`	`1`	`110x xxxx`	Last 768 words of PFM			Yes	Yes
`1`	`1`	`10xx xxxx`	Last 896 words of PFM			Yes	Yes
`1`	`1`	`0xxx xxxx`	Last 1024 words of PFM			Yes	Yes
`0`	`1`	`1111 1111`	Storage Area Flash disabled			Yes	No
`0`	`1`	`1111 1110`	Last 128 words of PFM			Yes	No
`0`	`1`	`1111 110x`	Last 256 words of PFM			Yes	No
`0`	`1`	`1111 10xx`	Last 384 words of PFM			Yes	No
`0`	`1`	`1111 0xxx`	Last 512 words of PFM			Yes	No
`0`	`1`	`1110 xxxx`	Last 640 words of PFM			Yes	No
`0`	`1`	`110x xxxx`	Last 768 words of PFM			Yes	No
`0`	`1`	`10xx xxxx`	Last 896 words of PFM			Yes	No
`0`	`1`	`0xxx xxxx`	Last 1024 words of PFM			Yes	No
`x`	`0`	`1111 1111`	Storage Area Flash disabled			No	No
`x`	`0`	`1111 1110`	Last 128 words of PFM			No	No
`x`	`0`	`1111 110x`	Last 256 words of PFM			No	No
`x`	`0`	`1111 10xx`	Last 384 words of PFM			No	No
`x`	`0`	`1111 0xxx`	Last 512 words of PFM			No	No
`x`	`0`	`1110 xxxx`	Last 640 words of PFM			No	No
`x`	`0`	`110x xxxx`	Last 768 words of PFM			No	No
`x`	`0`	`10xx xxxx`	Last 896 words of PFM			No	No
`x`	`0`	`0xxx xxxx`	Last 1024 words of PFM			No	No

When SAFLOCK = 0, once a SAFSZ bit is programmed to 0 through ICSP or a self-write, it can never be erased to a ‘1’, not even through a Bulk Erase.When SAFLOCK = 1, once a SAFSZ bit is programmed to 0 through ICSP or a self-write, it can only be reset though a Bulk Erase.

6.8 CONFIG8

Bits 7:0 – SAFSZ[7:0] Storage Area Flash (SAF) Block Size Selection(1)(2)

Bits 7:0 – SAFSZ[7:0] Storage Area Flash (SAF) Block Size Selection⁽¹⁾⁽²⁾