8.5.9 CONFIG9

Configuration Byte 9

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:	CONFIG9
Address:	30 0019h


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] SAF Block Size Selection^{(1, 2)}

Table 8-2. SAF Block Size
Value	Condition		SAF Block Size			SAF Bulk Erase	SAF Self-write
Value	WRTSAF	SAFLOCK	PIC18Fx4Q20	PIC18Fx5Q20	PIC18Fx6Q20	SAF Bulk Erase	SAF Self-write
`1111 1111`	`1`	`1`	Storage Area Flash disabled			Yes	Yes
`1111 1110`	`1`	`1`	Last 128 words of PFM			Yes	Yes
`1111 110x`	`1`	`1`	Last 256 words of PFM			Yes	Yes
`1111 10xx`	`1`	`1`	Last 384 words of PFM			Yes	Yes
`1111 0xxx`	`1`	`1`	Last 512 words of PFM			Yes	Yes
`1110 xxxx`	`1`	`1`	Last 640 words of PFM			Yes	Yes
`110x xxxx`	`1`	`1`	Last 768 words of PFM			Yes	Yes
`10xx xxxx`	`1`	`1`	Last 896 words of PFM			Yes	Yes
`0xxx xxxx`	`1`	`1`	Last 1024 words of PFM			Yes	Yes
`1111 1111`	`0`	`1`	Storage Area Flash disabled			Yes	No
`1111 1110`	`0`	`1`	Last 128 words of PFM			Yes	No
`1111 110x`	`0`	`1`	Last 256 words of PFM			Yes	No
`1111 10xx`	`0`	`1`	Last 384 words of PFM			Yes	No
`1111 0xxx`	`0`	`1`	Last 512 words of PFM			Yes	No
`1110 xxxx`	`0`	`1`	Last 640 words of PFM			Yes	No
`110x xxxx`	`0`	`1`	Last 768 words of PFM			Yes	No
`10xx xxxx`	`0`	`1`	Last 896 words of PFM			Yes	No
`0xxx xxxx`	`0`	`1`	Last 1024 words of PFM			Yes	No
`1111 1111`	`x`	`0`	Storage Area Flash disabled			No	No
`1111 1110`	`x`	`0`	Last 128 words of PFM			No	No
`1111 110x`	`x`	`0`	Last 256 words of PFM			No	No
`1111 10xx`	`x`	`0`	Last 384 words of PFM			No	No
`1111 0xxx`	`x`	`0`	Last 512 words of PFM			No	No
`1110 xxxx`	`x`	`0`	Last 640 words of PFM			No	No
`110x xxxx`	`x`	`0`	Last 768 words of PFM			No	No
`10xx xxxx`	`x`	`0`	Last 896 words of PFM			No	No
`0xxx xxxx`	`x`	`0`	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.

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