PIC18LF4331-ESLASHML datasheet(322/392 Pages) MICROCHIP

322 / 392 page

PIC18F2331/2431/4331/4431

DS39616D-page 322

 2010 Microchip Technology Inc.

TBLWT

Table Write

Syntax:

[ label ]

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

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 8.0 “Flash Pro-

gram 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-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

TBLWT Table Write (Continued)

Words:

Cycles: 2

Q Cycle Activity:

Decode

operation

(Read

TABLAT)

operation

(Write to

Holding

Example 1:

TBLWT

*+;

Before Instruction

TABLAT

0x55

TBLPTR

0x00A356

HOLDING REGISTER

(0x00A356)

0xFF

After Instructions (table write completion)

TABLAT

0x55

TBLPTR

0x00A357

HOLDING REGISTER

(0x00A356)

0x55

Example 2:

TBLWT

+*;

Before Instruction

TABLAT

0x34

TBLPTR

0x01389A

HOLDING REGISTER

(0x01389A)

0xFF

HOLDING REGISTER

(0x01389B)

0xFF

After Instruction (table write completion)

TABLAT

0x34

TBLPTR

0x01389B

HOLDING REGISTER

(0x01389A)

0xFF

HOLDING REGISTER

(0x01389B)

0x34

PIC18LF4331-E/ML Datasheet(PDF) 322 Page - Microchip Technology

PIC18LF4331-E/ML Datasheet(HTML) 322 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL