Renesas RL78 Series User Manual

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.

Renesas RL78 Series Specifications

General

Core	RL78
CPU Clock Speed	Up to 32 MHz
Flash Memory	Up to 512 KB
RAM	Up to 32 KB
Operating Voltage	1.6 V to 5.5 V
Low Power Modes	HALT, STOP, SNOOZE
CPU Architecture	16-bit
Temperature Range	-40°C to +85°C
Package	LQFP
Timers	16-bit timers
Communication Interfaces	UART, I2C, LIN
A/D Converter	12-bit