RL78/G15 CHAPTER 5 CLOCK GENERATOR
R01UH0959EJ0110 Rev.1.10 Page 146 of 765
Mar 7, 2023
5.3.9 High-speed on-chip oscillator trimming register (HIOTRM)
This register is used to adjust the accuracy of the high-speed on-chip oscillator.
With self-measurement of the high-speed on-chip oscillator frequency via a timer using high-accuracy external clock
input (timer array unit), and so on, the accuracy can be adjusted.
The HIOTRM register can be set by an 8-bit memory manipulation instruction.
Caution The frequency will vary if the temperature and V
DD
pin voltage change after accuracy adjustment.
When the temperature and V
DD
voltage change, accuracy adjustment must be executed regularly or
before the frequency accuracy is required.
Figure 5-10. Format of High-Speed On-Chip Oscillator Trimming Register (HIOTRM)
Address: F00A0H After reset: undefined
Note 1
R/W
Symbol 7 6 5 4 3 2 1 0
HIOTRM 0 0 HIOTRM5 HIOTRM4 HIOTRM3 HIOTRM2 HIOTRM1 HIOTRM0
HIOTRM5 HIOTRM4 HIOTRM3 HIOTRM2 HIOTRM1 HIOTRM0
High-speed on-chip
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 Maximum speed
Note 1. The value after reset is the value adjusted at shipment.
Remark The HIOTRM register holds a six-bit value used to adjust the high-speed on-chip oscillator with an increment
of 1 corresponding to an increase of frequency by about 0.05%.
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