W78L801A24DL Просмотр технического описания (PDF) - Winbond

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W78L801A24DL

8-BIT MICROCONTROLLER

Winbond 

W78L801

Interrupt Request Flag Register

Bit:

7

6

5

4

3

2

1

0

IQ9 IQ8 IQ7 IQ6 IQ5 IQ4 IQ3 IQ2

Mnemonic: IRQ

Address: C0H

IQ9: External interrupt 9 request flag.

IQ8: External interrupt 8 request flag.

IQ7: External interrupt 7 request flag.

IQ6: External interrupt 6 request flag.

IQ5: External interrupt 5 request flag.

IQ4: External interrupt 4 request flag.

IQ3: External interrupt 3 request flag.

IQ2: External interrupt 2 request flag.

Table.1 Priority level for simultaneous requests of the same priority interrupt sources

SOURCE

External Interrupt 0

External Interrupt 5

Timer 0 Overflow

External Interrupt 6

External Interrupt 1

External Interrupt 2

External Interrupt 7

Timer 1 Overflow

External Interrupt 3

External Interrupt 8

External Interrupt 4

External Interrupt 9

FLAG

IE0

IQ5

TF0

IQ6

IE1

IQ2

IQ7

TF1

IQ3

IQ8

IQ4

IQ9

PRIORITY LEVEL

(highest)

(lowest)

VECTOR ADDRESS

0003H

0053H

000BH

005BH

0013H

003BH

0063H

001BH

0043H

006BH

004BH

0073H

Watchdog Timer

The Watchdog timer is a free-running timer which can be programmed by the user to serve as a

system monitor, a time-base generator or an event timer. It is basically a set of dividers that divide the

system clock. The divider output is selectable and determines the time-out interval. When the time-out

occurs, a system reset can be caused if it is enabled. The main use of the Watchdog timer is as a

system monitor. This is important in real-time control applications. In case of power glitches or electro-

magnetic interference, the processor may begin to execute errant code. If this is left unchecked the

entire system may crash. The watchdog time-out selection will result in different time-out values

depending on the clock speed. The Watchdog timer will be disabled on reset. In general, software

should restart the Watchdog timer to put it into a known state. The control bits that support the

Watchdog timer are discussed below.

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