SAM47 INSTRUCTION SET
KS57C2308/P2308/C2316/P2316
5-86
SRET
— Return From Subroutine and Skip
SRET
Operation:
Operand
Operation Summary
Bytes
Cycles
–
Return from subroutine and skip
1
3 + S
Description:
SRET is normally used to return to the previously executing procedure at the end of a subroutine
that was initiated by a CALL or CALLS instruction. SRET skips the resulting address, which is
generally the instruction immediately after the point at which the subroutine was called. Then,
program execution continues from the resulting address and the contents of the location
addressed by the stack pointer are popped into the program counter.
Operand
Binary Code
Operation Notation
–
1
1
1
0
0
1
0
1
PC13–8
←
(SP + 1) (SP)
PC7–0
←
(SP + 3) (SP + 2)
EMB,ERB
←
(SP + 4)
SP
←
SP + 6
Example:
If the stack pointer contains the value 0FAH and RAM locations 0FAH, 0FBH, 0FCH, and 0FDH
contain the values 1H, 0H, 5H, and 2H, respectively, the instruction
SRET
leaves the stack pointer with the value 00H and the program returns to continue execution at
location 0125H, then skips unconditionally.
During a return from subroutine, data is popped from the stack to the PC as follows:
SP
→
(0FAH)
PC11–PC8
SP + 1 (0FBH)
0
0
PC13
PC12
SP + 2(0FCH)
PC3–PC0
SP + 3(0FDH)
PC7–PC4
SP + 4(0FEH)
0
0
EMB
ERB
SP + 5(0FFH)
0
0
0
0
SP + 6(00H)
Summary of Contents for KS57C2308
Page 30: ...ADDRESS SPACES KS57C2308 P2308 C2316 P2316 2 22 NOTES ...
Page 168: ...SAM47 INSTRUCTION SET KS57C2308 P2308 C2316 P2316 5 94 NOTES ...
Page 170: ......
Page 206: ...POWER DOWN KS57C2308 P2308 C2316 P2316 8 8 NOTES ...
Page 210: ...RESET KS57C2308 P2308 C2316 P2316 9 4 NOTES ...
Page 222: ...I O PORTS KS57C2308 P2308 C2316 P2316 10 12 NOTES ...
Page 272: ...LCD CONTROLLER DRIVER KS57C2308 P2308 C2316 P2316 12 24 NOTES ...
Page 280: ...SERIAL I O INTERFACE KS57C2308 P2308 C2316 P2316 13 8 NOTES ...
Page 294: ...MECHANICAL DATA KS57C2308 P2308 C2316 P2316 15 2 NOTES ...
Page 310: ...KS57P2308 P2316 OTP KS57C2308 P2308 C2316 P2316 16 16 NOTES ...
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