PCM18XK1 Microchip Technology, PCM18XK1 Datasheet - Page 406

• Manufacturer Part Number: PCM18XK1
• Description: MODULE PROC PIC18F8680,6680,8565
• Manufacturer: Microchip Technology

Specifications of PCM18XK1

• Accessory Type: Processor Module
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: ICE2000
• For Use With: ICE2000 - EMULATOR MPLAB-ICE 2000 POD
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F6585/8585/6680/8680
TBLWT
Syntax:
Operands:
Operation:
Status Affected: None
Encoding:
Description:
DS30491C-page 404
[ label ] TBLWT ( *; *+; *-; +*)
None
if TBLWT*,
(TABLAT)
TBLPTR – No Change;
if TBLWT*+,
(TABLAT)
(TBLPTR) + 1
if TBLWT*-,
(TABLAT)
(TBLPTR) – 1
if TBLWT+*,
(TBLPTR) + 1
(TABLAT)
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 Section 5.0 “Flash Program
Memory” for additional details on
programming Flash memory.)
The TBLPTR (a 21-bit pointer) points
to each byte in the program memory.
TBLPTR has a 2-MBtye 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
Table Write
0000
TBLPTR[0] = 0:Least Significant
TBLPTR[0] = 1:Most Significant
0000
Holding Register;
Holding Register;
Holding Register;
Holding Register;
TBLPTR;
TBLPTR;
TBLPTR;
0000
Byte of Program
Memory Word
Byte of Program
Memory Word
nn=0 *
=1 *+
=2 *-
=3 +*
11nn
TBLWT
Words: 1
Cycles: 2
Q Cycle Activity:
Example1:
Example 2:
Before Instruction
After Instructions (table write completion)
Before Instruction
After Instruction (table write completion)
TABLAT
TBLPTR
HOLDING REGISTER
(0x00A356)
TABLAT
TBLPTR
HOLDING REGISTER
(0x00A356)
TABLAT
TBLPTR
HOLDING REGISTER
(0x01389A)
HOLDING REGISTER
(0x01389B)
TABLAT
TBLPTR
HOLDING REGISTER
(0x01389A)
HOLDING REGISTER
(0x01389B)
operation
Decode
Table Write (Continued)
Q1
No
TBLWT
TBLWT
operation
operation
TABLAT)
 2004 Microchip Technology Inc.
(Read
Q2
No
No
*+;
+*;
=
=
=
=
=
=
=
=
=
=
=
=
=
=
operation
operation
0x55
0x00A356
0xFF
0x55
0x00A357
0x55
0x34
0x01389A
0xFF
0xFF
0x34
0x01389B
0xFF
0x34
Q3
No
No
Register )
operation
operation
(Write to
Holding
Q4
No
No