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參數(shù)資料
| 型號(hào)： | UPD17072 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM |
| 中文描述： | 4位單芯片的數(shù)字調(diào)諧系統(tǒng)硬件單片機(jī) |
| 文件頁(yè)數(shù)： | 25/226頁(yè) |
| 文件大?。?/td> | 1250K |
| 代理商： | UPD17072 |
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25
μ
PD17072,17073
3.4 Operations of Address Stack
3.4.1 Subroutine call (“CALL addr” or “CALL @AR”) and return (“RET” or “RETSK”) instructions
When a subroutine call instruction is executed, the value of the stack pointer is decremented by one and the return
address is stored to the address stack register specified by the stack pointer.
When a return instruction is executed, the contents of the address stack specified by the stack pointer (return
address) is restored to the program counter, and the value of the stack pointer is incremented by one.
3.4.2 Table reference instruction (“MOVT DBF, @AR”)
When the table reference instruction is executed, the value of the stack pointer is decremented by one and the
return address is stored to the address stack register specified by the stack pointer.
Next, the contents of the program memory addressed by the address register are read to the data buffer, and the
contents of the address stack register specified by the stack pointer (return address) are restored to the program
counter. The value of the stack pointer is then incremented by one.
3.4.3 On acceptance of interrupt and execution of return instruction (“RETI” instruction)
When an interrupt is accepted, the value of the stack pointer is decremented by one, and the return address is
stored to the address stack register specified by the stack address.
When the return instruction is executed, the contents of the address stack register specified by the stack pointer
(return address) are restored to the program counter and the value of the stack pointer is incremented by one.
3.4.4 Address stack manipulation instructions (“PUSH AR” and “POP AR”)
When the “PUSH” instruction is executed, the value of the stack pointer is decremented by one, and the contents
of the address register are transferred to the address stack register specified by the stack pointer.
When the “POP” instruction is executed, the contents of the address stack register specified by the stack pointer
are transferred to the address register, and the value of the stack pointer is incremented by one.
3.5 Notes on Using Address Stack
The nesting level of the address stack is two, and the value of the address stack register ASR2 is “undefined” when
the value of the stack pointer is 2H.
Consequently, if a subroutine is called or an interrupt is used exceeding 2 levels without manipulating the stack,
program execution returns to an “undefined” address.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD17072GB | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM |
| UPD17072GB-XXX-1A7 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| UPD17072GB-XXX-9EU | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| UPD17073 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM |
| UPD17073GB | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM |
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