參數(shù)資料
型號(hào)： UPD70433R-12
廠商： NEC Corp.
元件分類： 16位微控制器
英文描述： V55PITM 16-BIT MICROPROCESSOR
中文描述： V55PITM 16位微處理器
文件頁數(shù)： 46/166頁
文件大小： 772K
代理商： UPD70433R-12
46
μ
PD70433
5.2.2
Register Bank Switching Function
In the V55PI, general register sets are mapped onto on-chip RAM, and register sets can be held in up to 16 banks. Interrupt
servicing is performed by automatically switching the register bank when a BRKCS or TSKSW instruction is executed or
when an interrupt is responded to. Because saving of registers to the stack previously performed by software is not required,
high-speed switching of the program execution environment is possible.
The register bank switching sequence is performed as follows (See
Figure 5-2
).
<1> The contents of PSW is saved to temporary register.
<2> The register bank is switched.
<3> IE and BRK are set to 0.
<4> The contents of PSW which is saved to the PC and the temporary register are saved to the saving area, respectively.
<5> The interrupt service routine start address offset value is loaded from the vector PC area in the register bank to
PC.
Figure 5-2. Register Bank Switching Sequence
(In Case of Register Bank Switching by Interrupt)
Old Register Bank
AW
CW
DW
BW
SP
BP
IX
IY
DS1
PS
SS
DS0
PC Save
PSW Save
Vector PC/DS3
DS2
New Register Bank
for Interrupt Servicing
AW
CW
DW
BW
SP
BP
IX
IY
DS1
PS
SS
DS0
PC Save
PSW Save
Vector PC/DS3
DS2
PSW
PC
Temporary Register
<2>
Register Bank Switching
<3>
IE = 0, BRK = 0
<1>
<5>
<4>
<4>
相關(guān)PDF資料
PDF描述
UPD70433R-16 V55PITM 16-BIT MICROPROCESSOR
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UPD70433R-16 制造商:NEC 制造商全稱:NEC 功能描述:V55PITM 16-BIT MICROPROCESSOR
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