參數(shù)資料
型號： 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)： 45/166頁
文件大小： 772K
代理商： UPD70433R-12
45
μ
PD70433
5.2
INTERRUPT RESPONSE METHODS
The V55PI has three interrupt response methods: a vectored interrupt function, register bank switching function, and
macro service function. In the case of a maskable interrupt request, one of these functions can be selected by means of
the interrupt request control register (IC
××
) for each interrupt source according to the purpose of the interrupt. The on-chip
interrupt controller handles interrupt requests according to the set response method.
5.2.1
Vectored Interrupts
A vectored interrupt can only be acknowledged in the interrupt enabled state (EI state). When a vectored interrupt is
acknowledged, the CPU enters the interrupt disabled state (DI state), and the current PSW contents and PC and PS contents
are saved to the stack. Then the corresponding vector is selected from the vector table, and the interrupt service routine
is started at the address indicated by that vector. Vector numbers are fixed for each interrupt source. In the DI state, interrupts
are held pending, and are acknowledged when the EI state is set again.
The return from the interrupt is performed by an RETI instruction. In the case of a hardware interrupt other than a non-
maskable interrupt, an FINT instruction must be executed before the return instruction. When a return is made from an
interrupt, the PC, PS and PSW are restored from the stack.
Figure 5-1. Interrupt Acknowledge Operation (Performed in Sequence <1>
→
<4>)
PSW
PS
PC
Vector Table
Stack
SP – 6
SP – 4
SP – 2
n: Vector Number
n
×
4
n
×
4 + 2
<4>
<2>
SP
←
SP – 6
<1>
<3>
IE = 0
BRK = 0
相關(guān)PDF資料
PDF描述
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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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