PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 137

• Manufacturer Part Number: PIC17C42
• Description: High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
• Manufacturer: Microchip Technology

SWAPF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example:
1996 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>
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
None
Read
0001
Q2
0x53
0x35
f
[0,1]
255
REG,
dest<7:4>;
dest<3:0>
110d
Execute
Q3
0
ffff
destination
Write to
Q4
ffff
TABLRD
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Decode
Q1
TBLATH or
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)
TBLATL
register
Read
1010
Q2
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
PIC17C4X
16-bit
10ti
incremented
Execute
f;
f;
Q3
DS30412C-page 137
TBLPTR
Table
ffff
register 'f'
Write
Pointer
TBLAT;
Q4
ffff