參數(shù)資料
型號(hào): HD404448
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系列微機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 18/123頁
文件大?。?/td> 726K
代理商: HD404448
HD404449 Series
18
An interrupt request occurs when the IF is set to 1 and the IM is set to 0. If the IE is 1 at that point, the
interrupt is processed. A priority programmable logic array (PLA) generates the vector address assigned to
that interrupt source.
The interrupt processing sequence is shown in figure 10 and an interrupt processing flowchart is shown in
figure 11. After an interrupt is acknowledged, the previous instruction is completed in the first cycle. The
IE is reset in the second cycle, the carry, status, and program counter values are pushed onto the stack
during the second and third cycles, and the program jumps to the vector address to execute the instruction
in the third cycle.
Program the JMPL instruction at each vector address, to branch the program to the start address of the
interrupt program, and reset the IF by a software instruction within the interrupt program.
Table 2
Vector Addresses and Interrupt Priorities
Reset/Interrupt
RESET,
STOPC
*
INT
0
INT
1
Timer A
Priority
Vector Address
$0000
1
$0002
2
$0004
3
$0006
Timer B, INT
2
Timer C, INT
3
Timer D, A/D
4
$0008
5
$000A
6
$000C
Serial 1, Serial 2
Note:
*
The
STOPC
interrupt request is valid only in stop mode
7
$000E
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