PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 132

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

PIC17C4X
RETURN
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example:
DS30412C-page 132
* Remember reading PCL causes PCLATH to be updated.
This will be the high address of where the RETURN instruc-
tion is located.
After Interrupt
Forced NOP
Decode
PC = TOS
Q1
Return from Subroutine
[ label ]
None
TOS
Return from subroutine. The stack is
popped and the top of the stack (TOS)
is loaded into the program counter.
1
2
RETURN
None
register
Read
PCL*
NOP
0000
Q2
PC;
RETURN
0000
Execute
Execute
Q3
0000
NOP
NOP
Q4
0010
RLCF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example:
Before Instruction
After Instruction
Decode
REG
C
REG
WREG
C
Q1
=
=
=
=
=
register 'f'
Rotate Left f through Carry
[ label ] RLCF
0
d
f<n>
f<7>
C
C
The contents of register 'f' are rotated
one bit to the left through the Carry
Flag. If 'd' is 0 the result is placed in
WREG. If 'd' is 1 the result is stored
back in register 'f'.
1
1
RLCF
Read
Q2
0001
1110 0110
0
1110 0110
1100 1100
1
f
[0,1]
d<0>
C
1996 Microchip Technology Inc.
255
d<n+1>;
C;
101d
Execute
Q3
register f
REG,0
f,d
ffff
destination
Write to
Q4
ffff