DS80C320-ENG datasheet(28/175 Pages) DALLAS

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High-Speed Microcontroller User’s Guide

28 of 175

External Interrupt Flag (EXIF)

SFR 91h

IE5

IE4

IE3

IE2

XT/ RG

RGMD

RGSL

BGS

RW-0

RW-*

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 INT5 . 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

on INT3 . 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.

XT/ RG

Bit 3

Crystal/Ring Source Select.

This bit selects the crystal oscillator or ring

oscillator as the desired clock source. This bit will be the inverse of RGMD

except during the crystal warm-up period when executing a ring oscillator

resume from Stop. XTUP (STATUS.4) must be set to 1 and XTOFF (PMR.3)

must be cleared to 0 before this bit can be set. Attempts to modify this bit when

these conditions are not met will be ignored. This bit must be cleared before

XTOFF can be set to 1. This bit is set to 1 after a power-on reset, and unchanged

by all other forms of reset. This bit is not used on the DS80C310 or DS80C320

and will be 1 when read.

0 = The ring oscillator is selected as the clock source. This setting is unaffected

by XTUP (STATUS.4) and XTOFF (PMR.3).

1 = The crystal oscillator is selected as the clock source. This setting is invalid

unless XTUP=1 and XTOFF=0.

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. The state of this bit will be undefined on devices which

do not incorporate a ring oscillator.

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

1 = Device is operating from the ring oscillator.

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