PIC18FXXK80 Datasheet, PDF (29/52 Pages) Microchip Technology – Flash Microcontroller Programming Specification

PIC18FXXK80 FAMILY
3.5 Boot Block Programming
The code sequence detailed in Table 3-11 should be
used, except that the address used in “Step 2” will be in
the range of 000000h to 0007FFh, or 000000h to
000FFFh, as defined by the BBSIZ bit in the
CONFIG4L register (see Table 5-1).
3.6 Configuration Bits Programming
Unlike code memory, the Configuration bits are
programmed a byte at a time. The Table Write, Begin
Programming 4-bit command (‘1111’) is used, but only
8 bits of the following 16-bit payload will be written. The
LSB of the payload will be written to even addresses and
the MSB will be written to odd addresses. The code
sequence to program two consecutive configuration
locations is shown in Table 3-15.
Note:
The address must be explicitly written for
each byte programmed. The addresses
can not be incremented in this mode.
TABLE 3-15: SET ADDRESS POINTER TO CONFIGURATION LOCATION
4-Bit
Command
Data Payload
Core Instruction
Step 1: Enable writes and direct access to configuration memory.
0000 8E 7F
BSF EECON1, EEPGD
0000 8C 7F
BSF EECON1, CFGS
Step 2: Set Table Pointer for configuration byte to be written; write even/odd addresses.⁽¹⁾
0000
0000
0000
0000
0000
0000
1111
0000
0000
0000
1111
0000
0E 30
6E F8
0E 00
6E F7
0E 00
6E F6
<MSB ignored><LSB>
00 00
0E 01
6E F6
<MSB><LSB ignored>
00 00
MOVLW 30h
MOVWF TBLPTRU
MOVLW 00h
MOVWF TBLPTRH
MOVLW 00h
MOVWF TBLPTRL
Load 2 bytes and start programming.
NOP - hold PGC high for time P9 and low for time P10.
MOVLW 01h
MOVWF TBLPTRL
Load 2 bytes and start programming.
NOP - hold PGC high for time P9A and low for time P10.
Note 1: Enabling the write protection of the Configuration bits (WRTC = 0 in CONFIG6H) will prevent further writing of
the Configuration bits. Always write all of the Configuration bits before enabling the write protection for the
Configuration bits.
FIGURE 3-9:
CONFIGURATION PROGRAMMING FLOW
Start
Start
Load Even
Configuration
Address
Load Odd
Configuration
Address
Program
LSB
Program
MSB
Delay P9A and P10
Time for Write
Done
Delay P9A and P10
Time for Write
Done
 2011 Microchip Technology Inc.
DS39972B-page 29