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PIC18F4520E/MLQTP Datasheet(PDF) 298 Page - Microchip Technology

Part # PIC18F4520E/MLQTP
Description  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4520E/MLQTP Datasheet(HTML) 298 Page - Microchip Technology

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PIC18F2420/2520/4420/4520
DS39631A-page 296
Preliminary
 2004 Microchip Technology Inc.
POP
Pop Top of Return Stack
Syntax:
POP
Operands:
None
Operation:
(TOS)
→ bit bucket
Status Affected:
None
Encoding:
0000
0000
0000
0110
Description:
The TOS value is pulled off the return
stack and is discarded. The TOS value
then becomes the previous value that
was pushed onto the return stack.
This instruction is provided to enable
the user to properly manage the return
stack to incorporate a software stack.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
No
operation
POP TOS
value
No
operation
Example:
POP
GOTO
NEW
Before Instruction
TOS
=
0031A2h
Stack (1 level down)
=
014332h
After Instruction
TOS
=
014332h
PC
=
NEW
PUSH
Push Top of Return Stack
Syntax:
PUSH
Operands:
None
Operation:
(PC + 2)
→ TOS
Status Affected:
None
Encoding:
0000
0000
0000
0101
Description:
The PC + 2 is pushed onto the top of
the return stack. The previous TOS
value is pushed down on the stack.
This instruction allows implementing a
software stack by modifying TOS and
then pushing it onto the return stack.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
PUSH
PC + 2 onto
return stack
No
operation
No
operation
Example:
PUSH
Before Instruction
TOS
=
345Ah
PC
=
0124h
After Instruction
PC
=
0126h
TOS
=
0126h
Stack (1 level down)
=
345Ah



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