PIC17C44-08SLASHP datasheet(137/240 Pages) MICROCHIP

137 / 240 page

DS30412C-page 137

PIC17C4X

SWAPF

Swap f

Syntax:

[

label ] SWAPF f,d

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

f<3:0>

→ dest<7:4>;

f<7:4>

→ dest<3:0>

Status Affected:

None

Encoding:

0001

110d

ffff

Description:

The upper and lower nibbles of register

'f' are exchanged. If 'd' is 0 the result is

placed in WREG. If 'd' is 1 the result is

placed in register 'f'.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

Execute

Write to

destination

Example:

SWAPF

REG,

Before Instruction

REG

0x53

After Instruction

REG

0x35

TABLRD

Table Read

Syntax:

[

label ]

TABLRD t,i,f

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

If t = 1,

TBLATH

→ f;

If t = 0,

TBLATL

→ f;

Prog Mem (TBLPTR)

→ TBLAT;

If i = 1,

TBLPTR + 1

→ TBLPTR

Status Affected:

None

Encoding:

1010

10ti

ffff

Description:

A byte of the table latch (TBLAT)

is moved to register ﬁle 'f'.

If t = 0: the high byte is moved;

If t = 1: the low byte is moved

Then the contents of the program

memory location pointed to by

the

16-bit

Table

Pointer

(TBLPTR) is loaded into the

16-bit Table Latch (TBLAT).

If i = 1: TBLPTR is incremented;

If i = 0: TBLPTR is not

incremented

Words:

Cycles:

2 (3 cycle if f = PCL)

Q Cycle Activity:

Decode

Read

TBLATH or

TBLATL

Execute

Write

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