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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁

  • NEC   NEC

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CHAPTER 6
STACK
6.6.3 Executing RETI Instruction
Table 6-4 shows stack operation during interrupt receipt and RETI instruction execution.
Table 6-4. Stack Operation during Interrupt Receipt and Return
Instruction
Receipt of interrupt
Operation
<1> Stack pointer (SP) is decremented.
<2> Value in the program counter (PC) is saved in the address stack register pointed to
by the stack pointer (SP).
<3> Values in the PSWORD flags (BCD, CMP, CY, Z, IXE) are saved in the interrupt stack.
<4> Vector address is transferred to the program counter (PC)
RETI
<1> Values in the interrupt stack register are restored to the PSWORD (BCD, CMP, CY
Z, IXE).
<2> Values in the address stack register pointed to by the stack pointer (SP) is restored
to the program counter (PC).
<3> Stack pointer (SP) is incremented.
6.7 STACK NESTING LEVELS AND THE PUSH AND POP INSTRUCTIONS
During execution of operations such as subroutine calls and returns, the stack pointer (SP) simply functions as
a 3-bit counter which is incremented and decremented. When the value in the stack pointer is 0H and a CALL or
MOVT instruction is executed or an interrupt is received, the stack pointer is decremented to 7H. The
碌
PD17120
subseries treats this condition as a fault and generates an internal reset signal.
In order to avoid this condition, when the address stack register is being used frequently, the PUSH and POP
instructions are used as necessary to save/return the address stack register.
Table 6-5 shows stack operation during the PUSH and POP instructions.
Table 6-5. Stack Operation during the PUSH and POP Instructions
Instruction
PUSH
Operation
<1> Stack pointer (SP) is decremented.
<2> Value in the address register (AR) is transferred to the address stack register pointed
to by the stack pointer (SP).
POP
<1> Value in the address stack register pointed to by the stack pointer (SP) is transferred
to the address register (AR).
<2> Stack pointer (SP) is incremented.
39

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