GMS81C2012K datasheet(71/107 Pages) HYNIX

71 / 107 page

HYUNDAI MicroElectronics

GMS81C2012/GMS81C2020

MAR. 2000 Ver 1.00

16. INTERRUPTS

The GMS81C20xx interrupt circuits consist of Interrupt

enable register (IENH, IENL), Interrupt request flags of

IRQH, IRQL, Priority circuit, and Master enable flag (“I”

flag of PSW). Nine interrupt sources are provided. The

configuration of interrupt circuit is shown in Figure 16-2.

The External Interrupts INT0 and INT1 each can be transi-

tion-activated (1-to-0 or 0-to-1 transition) by selection

IEDS.

The flags that actually generate these interrupts are bit

INT0F and INT1F in register IRQH. When an external in-

terrupt is generated, the flag that generated it is cleared by

the hardware when the service routine is vectored to only

if the interrupt was transition-activated.

The Timer 0 ~ Timer 1 Interrupts are generated by TxIF

which is set by a match in their respective timer/counter

BITIF which is set by an overflow in the timer register.

The AD converter Interrupt is generated by ADIF which is

set by finishing the analog to digital conversion.

The Watchdog timer Interrupt is generated by WDTIF

which set by a match in Watchdog timer register.

The Basic Interval Timer Interrupt is generated by BITIF

which are set by a overflow in the timer counter register.

The interrupts are controlled by the interrupt master enable

flag I-flag (bit 2 of PSW on page 26), the interrupt enable

IRQH and IRQL) except Power-on reset and software

BRK interrupt. Below table shows the Interrupt priority.

Vector addresses are shown in Figure 8-6 on page 28. In-

terrupt enable registers are shown in Figure 16-3. These

registers are composed of interrupt enable flags of each in-

terrupt source and these flags determines whether an inter-

rupt will be accepted or not. When enable flag is “0”, a

corresponding interrupt source is prohibited. Note that

PSW contains also a master enable bit, I-flag, which dis-

ables all interrupts at once.

Figure 16-1 Interrupt Request Flag

Reset/Interrupt

Symbol

Priority

Hardware Reset

External Interrupt 0

External Interrupt 1

Timer/Counter 0

Timer/Counter 1

ADC Interrupt

Watchdog Timer

Basic Interval Timer

Serial Communication

RESET

INT0

INT1

TIMER0

TIMER1

ADC

WDT

BIT

SCI

R/W

INT0IF

INITIAL VALUE: 0000 ----B

ADDRESS: 0E4H

IRQH

INT1IF

MSB

T0IF

T1IF

R/W

Timer/Counter 1 interrupt request flag

SPIF

R/W

ADIF

Serial Communication interrupt request flag

INITIAL VALUE: 0000 ----B

ADDRESS: 0E5H

IRQL

WDTIF

MSB

LSB

BITIF

R/W

Timer/Counter 0 interrupt request flag

R/W

Basic Interval imer interrupt request flag

Watchdog timer interrupt request flag

A/D Conver interrupt request flag

External interrupt 1 request flag

External interrupt 0 request flag

LSB

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