Renesas RL78 Series - High-Speed On-Chip Oscillator Trimming Register (HIOTRM)

RL78/F13, F14 CHAPTER 5 CLOCK GENERATOR
R01UH0368EJ0210 Rev.2.10 387
Dec 10, 2015
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, and so on, the accuracy can be adjusted.
Set the HIOTRM register 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 VDD voltage change, accuracy adjustment must be
executed regularly or before the frequency accuracy is required.
Figure 5-16. Format of High-Speed On-Chip Oscillator Trimming Register (HIOTRM)
Address: F00A0H After reset: Note 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 1
0
1 1 1 1 1 1 1 Maximum speed
Note The reset value differs for each chip.