PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 526
PIC18F25K80
Manufacturer Part Number
PIC18F25K80
Description
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F25K80.pdf
(628 pages)
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PIC18F66K80 FAMILY
TBLWT
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
DS39977C-page 526
Table Write
TBLWT ( *; *+; *-; +*)
None
if TBLWT*,
(TABLAT) Holding Register;
TBLPTR – No Change
if TBLWT*+,
(TABLAT) Holding Register;
(TBLPTR) + 1 TBLPTR
if TBLWT*-,
(TABLAT) Holding Register;
(TBLPTR) – 1 TBLPTR
if TBLWT+*,
(TBLPTR) + 1 TBLPTR;
(TABLAT) Holding Register
None
This instruction uses the 3 LSBs of
TBLPTR to determine which of the
8 holding registers the TABLAT is written
to. The holding registers are used to
program the contents of Program Memory
(P.M.). (Refer to
Organization”
programming Flash memory.)
The TBLPTR (a 21-bit pointer) points to
each byte in the program memory.
TBLPTR has a 2-Mbyte address range.
The LSb of the TBLPTR selects which
byte of the program memory location to
access.
The TBLWT instruction can modify the
value of TBLPTR as follows:
• no change
• post-increment
• post-decrement
• pre-increment
1
2
operation
Decode
0000
TBLPTR[0] = 0 : Least Significant Byte
TBLPTR[0] = 1 : Most Significant Byte
Q1
No
operation
operation
TABLAT)
(Read
0000
Q2
No
No
for additional details on
Section 6.0 “Memory
of Program Memory
Word
of Program Memory
Word
operation
operation
0000
Q3
No
No
nn=0 *
operation
operation
Register)
(Write to
Holding
=1 *+
=2 *-
=3 +*
11nn
Q4
No
No
Preliminary
TBLWT
Example 1:
Example 2:
Before Instruction
After Instructions (table write completion)
Before Instruction
After Instruction (table write completion)
TABLAT
TBLPTR
HOLDING REGISTER
(00A356h)
TABLAT
TBLPTR
HOLDING REGISTER
(00A356h)
TABLAT
TBLPTR
HOLDING REGISTER
(01389Ah)
HOLDING REGISTER
(01389Bh)
TABLAT
TBLPTR
HOLDING REGISTER
(01389Ah)
HOLDING REGISTER
(01389Bh)
Table Write (Continued)
TBLWT *+;
TBLWT +*;
2011 Microchip Technology Inc.
=
=
=
=
=
=
=
=
=
=
=
=
=
=
55h
00A356h
FFh
55h
00A357h
55h
34h
01389Ah
FFh
FFh
34h
01389Bh
FFh
34h
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