PIC17C756A MICROCHIP [Microchip Technology], PIC17C756A Datasheet - Page 227

• Manufacturer Part Number: PIC17C756A
• Description: High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

SWAPF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example:
2000 Microchip Technology Inc.
Before Instruction
After Instruction
Decode
REG
REG
Q1
=
=
register ’f’
Swap f
[ label ] SWAPF f,d
0
d
f<3:0>
f<7:4>
None
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’.
1
1
SWAPF
Read
0001
Q2
0x53
0x35
f
[0,1]
255
REG,
dest<7:4>;
dest<3:0>
110d
Process
Data
Q3
0
ffff
destination
Write to
Q4
ffff
TABLRD
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
operation
Decode
Q1
No
(Table Pointer
on Address
TBLATH or
operation
TBLATL
register
Table Read
[ label ] TABLRD t,i,f
0
i
t
If t = 1,
TBLATH
If t = 0,
TBLATL
Prog Mem (TBLPTR)
If i = 1,
TBLPTR + 1
If i = 0,
TBLPTR is unchanged
None
1.
2.
3.
1
2 (3-cycle if f = PCL)
Read
bus)
Q2
No
1010
[0,1]
[0,1]
f
A byte of the table latch (TBLAT)
is moved to register file ’f’.
If t = 1: the high byte is moved;
If t = 0: the low byte is moved.
Then, the contents of the pro-
gram memory location pointed to
by the 16-bit Table Pointer
(TBLPTR) are loaded into the
16-bit Table Latch (TBLAT).
If i = 1: TBLPTR is incremented;
If i = 0: TBLPTR is not
PIC17C7XX
255
10ti
operation
f;
incremented.
Process
f;
Data
Q3
No
TBLPTR
DS30289B-page 227
ffff
(OE goes low)
register ’f’
operation
TBLAT;
Write
Q4
No
ffff