TC1784
System Control Unit (SCU)
User´s Manual
3-31
V1.1, 2011-05
32-bit SCU, V1.18
MODE
[6:5]
rw
Oscillator Mode
This bit field defines which mode can be used and if
the oscillator entered the Power-Saving Mode or not.
00
B
External Crystal Mode and External Input
Clock Mode. The oscillator Power-Saving
Mode is not entered.
01
B
OSC is disabled. The oscillator Power-Saving
Mode is not entered.
10
B
External Input Clock Mode and the oscillator
Power-Saving Mode is entered
11
B
OSC is disabled. The oscillator Power-Saving
Mode is entered.
PLLHV
8
rh
Oscillator for PLL Valid High Status Bit
This bit indicates if the frequency output of OSC is
usable for the VCO part of the PLL.
This is checked by the Oscillator Watchdog of the
PLL.
0
B
The OSC frequency is not usable. Frequency
f
OSC
is too high.
1
B
The OSC frequency is usable
PLLSP
9
rh
Oscillator for PLL Valid Spike Status Bit
This bit indicates if the frequency output of OSC is
usable for the VCO part of the PLL.
This is checked by the Oscillator Watchdog of the
PLL.
0
B
The OSC frequency is not usable. Spikes are
detected that disturb a locked operation
1
B
The OSC frequency is usable
X1D
10
rh
XTAL1 Data Value
This bit monitors the value (level) of pin XTAL1. If
XTAL1 is not used as clock input it can be used as
GPI pin.
This bit is only updated if X1DEN is set.
X1DEN
11
rw
XTAL1 Data Enable
0
B
Bit X1D is not updated
1
B
Bit X1D can be updated
Field
Bits
Type
Description
Содержание TC1784
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