Exit Exit - Samsung S3P80C5 User Manual

INSTRUCTION SET
EXIT
— Exit
EXIT
Operation: IP
SP
PC
IP
This instruction is useful when implementing threaded-code languages. The stack value is
popped and loaded into the instruction pointer. The program memory word that is pointed to by
the instruction pointer is then loaded into the program counter, and the instruction pointer is
incremented by two.
Flags: No flags are affected.
Format:
opc
Example: The diagram below shows one example of how to use an EXIT statement.
Address Data
0050
IP
PC 0040
0022
SP
20 IPH 00
21 IPL 50
22 Data
Stack
6-42
←
@SP
←
SP + 2
←
@IP
←
IP + 2
Before
Address
50 PCL old
51 PCH
140 Exit
Memory
Bytes
1
Address
0052
IP
Data
PC 0060
60
00
0022
SP
2F
22 Data
Stack
S3P80C5/C80C5/C80C8
Cycles
14 (internal stack)
16 (internal stack)
After
Data
Address
60 Main
Memory
Opcode (Hex)
2F
Data