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BAT32G1x9 user manual | Chapter 4 Clock generation circuit
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Rev.1.02
4.3.10
Trimming Register (HIOTRM) for high-speed internal oscillator
This is a register that corrects for the accuracy of the high-speed internal oscillator. Self-measurement and accuracy
correction of high-speed internal oscillator frequency can be performed using a timer with a high-precision external clock
input, etc. The HIOTRM register is set via the 8-bit memory operation instruction.
Note that if the temperature and voltage of the V
DD
pin change after correcting the accuracy, the frequency changes.
In the event of a change in temperature and voltage at the V
DD
pin, corrections need to be made before requiring
accuracy of the frequency or periodically.
Figure 4-15 The format of the Trimming Register (HIOTRM) of the high-speed internal oscillator
Address: 40021C00H
reset value: Note
R/W
SYMBOL
7
6
5
4
3
2
1
0
HIOTRM
HIOTRM5
HIOTRM4
HIOTRM3
HIOTRM2
HIOTRM1
HIOTRM0
High-speed internal
oscillator
0
0
0
0
0
0
Minimum speed
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
1
1
0
0
0
1
0
0
•
•
•
1
1
1
1
1
0
1
1
1
1
1
1
Highest speed
Note The reset value is the adjusted value at the time of shipment.
Note 1. Each bit of the HIOTRM register can correct the clock accuracy of the high-speed internal oscillator by about
0.05%.
0
0
HIOTRM5
HIOTRM4
HIOTRM3
HIOTRM2
HIOTRM1
HIOTRM0