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參數(shù)資料
| 型號： | SDA20C440 |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PQFP80 |
| 封裝： | PLASTIC, MQFP-80 |
| 文件頁數(shù)： | 8/55頁 |
| 文件大小： | 990K |
| 代理商： | SDA20C440 |
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SDA 20C440
Semiconductor Group
16
2.3
Interrupt System
Three interrupt sources are provided, which are:
q
Timer Interrupt
q
Serial Interface Interrupt
q
External Interrupt
Each of these interrupt vectors to its special interrupt routine location. All interrupts are serviced at
the same priority level. Before enabling an interrupt source, the corresponding request bit in IREQ0
has to be set to 0.
Three special function registers are used to control the interrupt functions:
IENA0:
The Interrupt Enable Register contains one enable bit for each interrupt source.
IENA2:
The Global Interrupt Enable Register contains one global enable bit to enable or disable
all individually enabled interrupts.
IREQ0:
The Interrupt Request Register contains one request bit for each interrupt; these bits are
set and cleared by hardware but may be set or cleared by software as well.
Each interrupt vector to its own interrupt location:
Response time: between 0.91
s and 2.3 s at an internal operating frequency of 12 MHz.
INT0
INT1
INT2
Serial Port Interrupt
0006H
External Interrupt
0009H
Timer Interrupt
000CH
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