PIC18F2680ISPQTP datasheet(402/482 Pages) MICROCHIP

402 / 482 page

PIC18F2585/2680/4585/4680

DS39625C-page 400

Preliminary

TBLWT

Table Write

Syntax:

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

Operands:

None

Operation:

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;

Status Affected:

None

Encoding:

0000

11nn

nn=0 *

=1 *+

=2 *-

=3 +*

Description:

This instruction uses the 3 LSBs of the

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 6.0 “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.

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:

Q Cycle Activity:

Decode

operation

(Read

TABLAT)

operation

(Write to

Holding

TBLWT

Table Write (Continued)

Example 1:

TBLWT *+;

Before Instruction

TABLAT

55h

TBLPTR

00A356h

HOLDING REGISTER

(00A356h)

FFh

After Instructions (table write completion)

TABLAT

55h

TBLPTR

00A357h

HOLDING REGISTER

(00A356h)

55h

Example 2:

TBLWT +*;

Before Instruction

TABLAT

34h

TBLPTR

01389Ah

HOLDING REGISTER

(01389Ah)

FFh

HOLDING REGISTER

(01389Bh)

FFh

After Instruction (table write completion)

TABLAT

34h

TBLPTR

01389Bh

HOLDING REGISTER

(01389Ah)

FFh

HOLDING REGISTER

(01389Bh)

34h

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