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參數(shù)資料
| 型號： | UPD17218GT |
| 廠商： | NEC Corp. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機的小型通用紅外遙控器 |
| 文件頁數(shù)： | 13/84頁 |
| 文件大?。?/td> | 350K |
| 代理商： | UPD17218GT |
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μ
PD17215, 17216, 17217, 17218
13
2.3.2
Function of stack
The address stack register stores a return address when the subroutine call instruction or table reference instruction (first
instruction cycle) is executed or when an interrupt is accepted. It also stores the contents of the address registers (ARs)
when a stack manipulation instruction (PUSH AR) is executed.
The WDOUT pin goes low if a subroutine call or interrupt exceeding 5 levels is executed.
The interrupt stack register (INTSK) saves the contents of the bank register (BANK) and program status word (PSWORD)
when an interrupt is accepted. The saved contents are restored when an interrupt return (RETI) instruction is executed.
INTSK saves data each time an interrupt is accepted, but
the data stored first is lost if more than 3 levels of interrupts
occur
.
2.3.3
Stack Pointer (SP) and Interrupt Stack Pointer
Table 2-1 shows the operations of the stack pointer (SP).
The stack pointer can take eight values, 0H-07. Because there are only five stack registers available, however,
the
WDOUT pin goes low if the value of SP is 6 or greater
.
Table 2-1 Operations of Stack Pointer
Instruction
Value of Stack Pointer (SP)
Counter of Interrupt Stack Register
CALL addr
CALL @AR
MOVT DBF, @AR
(1st Instruction Cycle)
PUSH AR
–1
0
When Interrupt Is Accepted
–1
–1
RET
RETSK
MOVT DBF, @AR
(2nd Instruction Cycle)
POP AR
+1
0
RET1
+1
+1
相關(guān)PDF資料 |
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| UPD17215GT | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
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| UPD17215 | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
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| UPD17232MC | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| UPD17225 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17225CT | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17225CT-XXX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| UPD17225GT | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17225GT-XXX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROCONTROLLER|4-BIT|UPD17K CPU|CMOS|SOP|28PIN|PLASTIC |
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