PIC17C752 MICROCHIP [Microchip Technology], PIC17C752 Datasheet - Page 213

• Manufacturer Part Number: PIC17C752
• Description: High-Performance 8-Bit CMOS EPROM Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

SWAPF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example:
1997 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,
If t = 0,
If i = 1,
None
1.
2.
3.
1
2 (3 cycle if f = PCL)
Read
bus)
Q2
No
1010
TBLATH
TBLATL
Prog Mem (TBLPTR)
TBLPTR + 1
[0,1]
[0,1]
f
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
(TBLPTR) is loaded into the
16-bit Table Latch (TBLAT).
If i = 1: TBLPTR is incremented;
If i = 0: TBLPTR is not
255
16-bit
operation
10ti
incremented
Process
Data
Q3
No
f;
f;
DS30264A-page 213
TBLPTR
Table
ffff
(OE goes low)
register 'f'
operation
Write
Q4
No
Pointer
TBLAT;
ffff