gc80c510 CORERIVER Semiconductor, gc80c510 Datasheet - Page 192

• Manufacturer Part Number: gc80c510
• Description: Eprom/rom 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

13.13 EXIF (91h) : External Interrupt Flag Register
Symbol
Bit No.
XT/RG
RGMD
RGSL
BGS
IE3
IE2
-
Reserved.
External Interrupt 3 Flag.
External Interrupt 2 Flag.
System Clock Selection.
Ring Mode.
Ring Select Bit when Power-down Wake-up.
Band-Gap Select.
manually by software. Setting this bit in software will cause an interrupt if enabled.
manually by software. Setting this bit in software will cause an interrupt if enabled.
Note : Don’t clear RINGON (OSCICN.2) flag when F
0 = The Ring oscillator is selected as the system clock.
1 = The crystal oscillator is selected as the system clock.
1 = When wake-up from Power-down mode in XTAL clock, the CPU uses Ring oscillator
Disabling the band-gap reference provides significant power savings in power-down
mode, but sacrifices the ability to perform 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 power-down mode, but will function during
1 = The band-gap reference will operate in Stop mode.
7
This bit will be set when a falling edge is detected on INT3B. This bit must be cleared
This bit will be set when a rising edge is detected on INT2. This bit must be cleared
This bit is set to “0” after a power-on reset, and unchanged by all other resets.
Now system clock is Ring or crystal oscillator Generally RGMD is the invert of XT/RG.
This bit enables/disables the band-gap reference during power-down mode.
-
as system clock during 65,536 XTAL clock.
normal operation. It will support the significant power savings in power-down mode.
6
-
R/W(0)
IE3
5
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R/W(0)
IE2
4
Description
R/W(1)
XT/RG
(Default = 0)
3
OSC
is Ring oscillator (XT/RG = 0).
(Default)
(Default)
RGMD
Appendix B: SFR description
R(1)
2
R/W(0)
RGSL
1
R/W(1)
BGS
0