gc80c520a CORERIVER Semiconductor, gc80c520a Datasheet - Page 166

• Manufacturer Part Number: gc80c520a
• Description: Midas1.0 Family Mask Rom/eprom/romless 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

15.14 External Interrupt Flag Register (EXIF)
Bit No.
91h
Symbol
BGS
IE5
IE4
IE3
IE2
XT
R/W(0)
IE5
7
Function
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.
Band-Gap Select. This bit enables/disables the band-gap reference during Stop mode.
Disabling the band-gap reference provides significant power savings in Stop mode, but
sacrifices the ability to perform a power fail interrupt or power-fail reset while stopped.
The state of this bit will be undefined on devices which do not incorporate a band-gap
reference.
0: The band-gap reference is disabled in Stop mode but will function during normal
operation.
1: The band-gap reference will operate in Stop mode.
Crystal Source Select. Don’t touch this bit. This bit is set to “1” after a power-on reset,
and unchanged by all other forms of reset.
1: The crystal oscillator is selected as the clock source.
R/W(0)
IE4
6
R/W(0)
IE3
5
R/W(0)
Page 166 of 187
IE2
4
R(1)
XT
3
2
-
Appendix B: SFR description
1
-
R/W(1)
BGS
0
EXIF