gc80c510 CORERIVER Semiconductor, gc80c510 Datasheet - Page 197

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

13.19 OSCICN (BEh) : Internal Ring Oscillator Control Register
13.20 PMR (C4h) : Power Management Register
MiDAS1.1 Family
Symbol
RINGON
Symbol
Bit No.
Bit No.
XTOFF
DIV1
DIV0
-
Reserved.
Internal Ring Oscillator Enable.
0 = Internal Ring Oscillator is killed.
1 = Internal Ring oscillator is running.
Mode
Internal Amplifier Disable for External Crystal Oscillator.
This bit controls the enable/disable the internal amplifier for external crystal oscillator.
0 = Internal amplifier is enabled.
1 = Internal amplifier is disabled.
Set the XTOFF bit to “1” when user wants to use P1[0] and P1[2] as general I/O pins.
Don’t set XTOFF bit to “1” when XT/RG bit (EXIF.3) is “1”.
(XT/RG = “1” : The external clock is selected as system clock. Refer to EXIF register.)
Note : Don’t clear this bit when F
0
1
2
3
7
Ring Oscillator Divider
7
-
-
crystal oscillator, internal ring oscillator can be run (RINGON=1).
DIV1
0
0
1
1
6
6
-
-
DIV0
0
1
0
1
5
5
-
-
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OSC
(Default)
(Default)
4
4
-
Description
is Ring oscillator (XT/RG = 0). But, although F
-
Description
Description (Ring Oscillator @ 5V)
R/W(0)
XTOFF
3
3
-
4 MHz / 1
4 MHz / 2
4 MHz / 4
4 MHz / 8
RINGON
R/W(1)
2
2
-
R/W(0)
DIV1
1
1
-
R/W(0)
DIV0
0
0
-
OSC
is