DS80C390 datasheet(21/155 Pages) DALLAS

21 / 155 page

DS80C390 High-Speed Microcontroller User’s Guide Supplement

21 of 155

External Interrupt Flag (EXIF)

6543

210

SFR 91h

IE5

IE4

IE3

IE2

CKRY

RGMD

RGSL

BGS

RW-0

R-*

RW-*

RT-0

R=Unrestricted Read, W=Unrestricted Write, T=Timed Access Write Only

-n=Value after Reset, *=See description

IE5

Bit 7

External Interrupt 5 Flag. This bit will be set when a falling edge is detected on

INT

. This bit must be cleared manually by software. Setting this bit in software

will cause an interrupt if enabled.

IE4

Bit 6

External Interrupt 4 Flag. This bit will be set when a rising edge is detected on

INT4. This bit must be cleared manually by software. Setting this bit in software

will cause an interrupt if enabled.

IE3

Bit 5

External Interrupt 3 Flag. This bit will be set when a falling edge is detected

INT

This bit must be cleared manually by software. Setting this bit in

software will cause an interrupt if enabled.

IE2

Bit 4

External Interrupt 2 Flag. This bit will be set when a rising edge is detected on

INT2. This bit must be cleared manually by software. Setting this bit in software

will cause an interrupt if enabled.

CKRY

Bit 3

Clock Ready. The CKRY bit indicates the status of the start-up period delay

used by the crystal oscillator and the crystal clock multiplier warm-up period.

CKRY=0 indicates the start-up delay is still counting. When the CKRY=1 the

counter has completed. This bit is cleared each time the CTM bit in the PMR

CKRY is set, the lockout is removed on the CD1, CD0 bits to select the

multiplied crystal clock as a system clock source. This status bit is also cleared

each time the crystal oscillator is restarted when exiting Stop mode.

RGMD

Bit 2

Ring Mode Status. This bit indicates the current clock source for the

device. This bit is cleared to 0 after a power-on reset, and unchanged by all

other forms of reset.

0 = Device is operating from the external crystal or oscillator.

1 = Device is operating from the ring oscillator.

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