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參數(shù)資料

型號(hào)：	HD404394S
廠商：	Hitachi,Ltd.
英文描述：	4-bit HMCS400-series microcomputer(4位單片微計(jì)算機(jī))
中文描述：	4位HMCS400系列微電腦（4位單片微計(jì)算機(jī)）
文件頁(yè)數(shù)：	25/100頁(yè)
文件大?。?/td>	610K
代理商：	HD404394S

HD404344R Series/HD404394 Series

Interrupts

There are five kinds of interrupts: external

INT

, timer B, timer C, serial interface, and A/D converter.

An interrupt request flag or an interrupt mask and vector address are used for each type of interrupt. They

are used for storing interrupt requests and interrupt controls. An interrupt enable flag is also used for total

interrupt control.

Interrupt Control Bits and Interrupt Processing:

The interrupt control bits are mapped from $000 to

$003 of RAM and can be accessed by RAM bit manipulation instructions. However, the interrupt request

flag (IF) cannot be set by software. An MCU reset initializes the interrupt enable flag (IE) and the interrupt

request flag (IF) to 0, and the interrupt mask (IM) to 1.

A block diagram of the interrupt control circuit is shown in figure 8. The interrupt priority order and vector

addresses are listed in a table in the figure, along with the conditions for executing the interrupt processing

of the five types of interrupt requests (table 2). An interrupt request occurs when the interrupt request flag

is set to 1 and the interrupt mask to 0. If the interrupt enable flag is 1, interrupt processing has occurred.

The vector address which corresponds to the interrupt source is generated from the priority PLA.

The interrupt processing sequence is shown in figure 9 and the interrupt processing flowchart is shown in

figure 10. After receiving an interrupt, the previous instruction is completed in the first cycle. The interrupt

enable flag (IE) is reset after two cycles. The contents of the carry flag, status flag, and program counter are

stored onto the stack at the second and third cycles. Instruction execution is restarted by jumping to the

vector address during the third cycle. The JMPL instructions, which branch to the start addresses of the

interrupt routines, should be programmed at each vector address area. The interrupt request which initiated

the interrupt processing should be reset by software instructions in the interrupt routine.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
HD404418F	制造商:未知廠家制造商全稱:未知廠家功能描述:4-Bit Microcontroller
HD404418H	制造商:未知廠家制造商全稱:未知廠家功能描述:4-Bit Microcontroller
HD404418S	制造商:未知廠家制造商全稱:未知廠家功能描述:4-Bit Microcontroller
HD404439FS	制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Five timer/counters
HD404439H	制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Five timer/counters

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