DM163006 datasheet(256/320 Pages) MICROCHIP

256 / 320 page

PIC18C601/801

DS39541A-page 256

Advance Information

 2001 Microchip Technology Inc.

TBLWT

Table Write

Syntax:

[ label ]

TBLWT ( *; *+; *-; +*)

Operands:

None

Operation:

if TBLWT*,

(TABLAT)

→ Prog Mem (TBLPTR) or

Holding Register;

TBLPTR - No Change;

if TBLWT*+,

(TABLAT)

→ Prog Mem (TBLPTR) or

Holding Register;

(TBLPTR) +1

→ TBLPTR;

if TBLWT*-,

(TABLAT)

→ Prog Mem (TBLPTR) or

Holding Register;

(TBLPTR) -1

→ TBLPTR;

if TBLWT+*,

(TBLPTR) +1

→ TBLPTR;

(TABLAT)

→ Prog Mem (TBLPTR) or

Holding Register;

Status Affected:

None

Encoding:

0000

11nn

nn=0 *

=1 *+

=2 *-

=3 +*

Description:

This instruction is used to program the

contents of Program Memory (P.M.).

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.

TBLPTR[0] = 0: Least Significant

Byte of Program

Memory Word

TBLPTR[0] = 1: Most Significant

Byte of Program

Memory Word

The TBLWT instruction can modify the

value of TBLPTR as follows:

• no change

• post-increment

• post-decrement

• pre-increment

Words:

Cycles:

2 (many if long write is to on-chip

EPROM program memory)

Q Cycle Activity:

Decode

operation

No operation

(Read

TABLAT)

operation

No operation

(Write to Holding

TBLWT (Cont.)

Example 1:

TBLWT

*+;

Before Instruction

TABLAT

55h

TBLPTR

00A356h

MEMORY(00A356h)

0FFh

After Instructions (table write completion)

TABLAT

55h

TBLPTR

00A357h

MEMORY(00A356h)

55h

Example 2:

TBLWT

+*;

Before Instruction

TABLAT

34h

TBLPTR

01389Ah

MEMORY(01389Ah)

0FFh

MEMORY(01389Bh)

0FFh

After Instruction (table write completion)

TABLAT

34h

TBLPTR

01389Bh

MEMORY(01389Ah)

0FFh

MEMORY(01389Bh)

34h

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