NEC PD754144 - Manual (Page 285)

CHAPTER 11 INSTRUCTION SET
285 User’s Manual U10676EJ3V0UM
RET
Function: [MkI mode] PC 11-8
← (SP), MBE, RBE, 0, 0 ← (SP+1)
PC 3-0
← (SP+2)
PC 7-4
← (SP+3), SP ← SP+4
[MkII mode] PC
11-8
← (SP), 0, 0, 0, 0 ← (SP+1)
PC
3-0
← (SP+2), PC
7-4
← (SP+3)
Ч, Ч, MBE, RBE ← (SP+4), SP ← SP+6
Restores the contents of the data memory (stack) addressed by the stack pointer (SP) to the program counter (PC),
memory bank enable flag (MBE), and register bank enable flag (RBE), and then increments the contents of the SP.
Caution
All the flags of the program status word (PSW) other than MBE and RBE are not restored.
RETS
Function: [MkI mode] PC
11-8
← (SP), MBE, RBE, 0, 0 ← (SP+1)
PC
3-0
← (SP+2), PC
7-4
← (SP+3), SP ← SP+4
Then skip unconditionally
[MkII mode] PC 11-8
← (SP), 0, 0, 0, 0 ← (SP+1)
PC 3-0
← (SP+2), PC 7-4
← (SP+3)
Ч, Ч, MBE, RBE ← (SP+4), SP ← SP+6
Then skip unconditionally
Restores the contents of the data memory (stack) addressed by the stack pointer (SP) to the program counter (PC),
memory bank enable flag (MBE), and register bank enable flag (RBE), increments the contents of the SP, and then
skips unconditionally.
Caution
All the flags of the program status word (PSW) other than MBE and RBE are not restored.
RETI
Function: [MkI mode] PC
11-8
← (SP), MBE, RBE, 0, 0 ← (SP+1)
PC
3-0
← (SP+2), PC
7-4
← (SP+3)
PSW
L
← (SP+4), PSW
H
← (SP+5)
SP ← SP+6
[MkII mode] PC 11-8
← (SP), 0, 0, 0, 0 ← (SP+1)
PC
3-0
← (SP+2), PC
7-4
← (SP+3)
PSW
L
← (SP+4), PSW
H
← (SP+5)
SP ← SP+6
Restores the contents of the data memory (stack) addressed by the stack pointer (SP) to the program counter (PC)
and program status word (PSW), and then increments the contents of the SP.
This instruction is used to return execution from an interrupt processing routine.
I/II
I/II
I/II