High-Speed On-Chip Oscillator Trimming Register (Hiotrm) - Renesas RL78/G1P Hardware User Manual

RL78/G1P

5.3.8 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
When the temperature and V
before the frequency accuracy is required.
Figure 5-10. Format of High-Speed On-Chip Oscillator Trimming Register (HIOTRM)
Address: F00A0H
Symbol 7
HIOTRM 0
HIOTRM5
0
0
0
0
0
1
1
Note The value after reset is adjusted at shipment.
Remarks 1. The HIOTRM register can be used to adjust the high-speed on-chip oscillator clock to an accuracy
within about 0.05%.
2. For the usage example of the HIOTRM register, see the application note for RL78 MCU Series High-
speed On-chip Oscillator (HOCO) Clock Frequency Correction (R01AN0464).
R01UH0895EJ0100 Rev.1.00
Nov 29, 2019
voltage change, accuracy adjustment must be executed regularly or
DD
After reset: Note R/W
6 5
0 HIOTRM5
HIOTRM4 HIOTRM3
0 0
0 0
0 0
0 0
0 0
1 1
1 1
CHAPTER 5 CLOCK GENERATOR
pin voltage change after accuracy adjustment.
DD
4 3
HIOTRM4 HIOTRM3
HIOTRM2 HIOTRM1
0 0
0 0
1
0
1
0
1
0



1 1
1 1
2 1
HIOTRM2 HIOTRM1 HIOTRM0
High-speed on-chip
HIOTRM0
oscillator
Minimum speed
0
1
0
1
0
0
1 Maximum speed
0
110