gc80c510 CORERIVER Semiconductor, gc80c510 Datasheet - Page 99

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

6.2.10.1 EXIF (91h) : External Interrupt Flag Register
MiDAS1.1 Family
Symbol
Bit No.
XT/RG
RGMD
RGSL
BGS
-
Reserved.
System Clock Selection.
Ring Mode.
Ring Select Bit when Power-down Wake-up.
Band-Gap Select.
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 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(0)
XT/RG
(Default = 0)
3
OSC
is Ring oscillator (XT/RG = 0).
(Default)
(Default)
RGMD
R(1)
2
R/W(0)
RGSL
1
R/W(1)
BGS
0