Datasheet

 2012 Microchip Technology Inc. DS30575A-page 559
PIC18F97J94 FAMILY
REGISTER 28-6: CONFIG4L: CONFIGURATION REGISTER 4 LOW (BYTE ADDRESS 300006h)
R/WO-1 R/WO-1 R/WO-1 R/WO-1 R/WO-1 R/WO-1 R/WO-1 R/WO-1
WPFP7 WPFP6 WPFP5 WPFP4 WPFP3 WPFP2 WPFP1 WPFP0
bit 7 bit 0
Legend: P = Programmable bit WO = Write-Once bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7-0 WPFP<7:0>: Write-Protect Program Flash Pages bits (valid when WPDIS = 0)
When WPEND =
0:
Write/erase protect Flash memory pages, starting at Page 0 and ending with Page WPFP<7:0>.
When WPEND = 1:
Write/erase protect Flash memory pages, starting at Page WPFP<7:0> and ending with the last page
in user Flash.
REGISTER 28-7: CONFIG4H: CONFIGURATION REGISTER 4 HIGH (BYTE ADDRESS 300007h)
U-1 U-1 U-1 U-1 U-1 R/WO-1 R/WO-1 R/WO-1
— — — — — WPCFG WPEND WPDIS
bit 7 bit 0
Legend: P = Programmable bit WO = Write-Once bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7-3 Unimplemented: Program the corresponding Flash Configuration bit to ‘1’
bit 2 WPCFG: Write/Erase Protect Last Page in User Flash bit
1 = Write/erase protection of last page is disabled, regardless of the WPFP<7:0> setting
0 = Write/erase protection of last page is enabled, regardless of the WPFP<7:0> setting
bit 1 WPEND: Write Protection End Page bit
This bit is valid when WPDIS = 0.
When WPEND =
0:
Write/erase protect Flash Memory pages, starting at Page 0 and ending with Page WPFP<7:0>.
When WPEND =
1:
Write/erase protect Flash memory pages, starting at Page WPFP<7:0> and ending with the last page
in user Flash.
bit 0 WPDIS: Write-Protect Disable bit
1 = WPFP<7:0>, WPEND and WPCFG bits are ignored
0 = WPFP<7:0>, WPEND and WPCFG bits are enabled; write-protect is active