DS80C390_00 Datasheet, PDF (21/155 Pages) Dallas Semiconductor – High-Speed Microcontroller User’s Guide Supplement

DS80C390 High-Speed Microcontroller User’s Guide Supplement
External Interrupt Flag (EXIF)
7
6
5
4
3
2
1
0
SFR 91h IE5
IE4
IE3
IE2
CKRY RGMD RGSL
BGS
RW-0 RW-0 RW-0 RW-0
R-*
R-*
RW-* RT-0
R=Unrestricted Read, W=Unrestricted Write, T=Timed Access Write Only
-n=Value after Reset, *=See description
IE5
Bit 7
IE4
Bit 6
IE3
Bit 5
IE2
Bit 4
CKRY
Bit 3
RGMD
Bit 2
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.
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.
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.
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.
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
register is changed from low to high to start the crystal multiplier. Once the
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.
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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