RL78/G10 CHAPTER 19 OPTION BYTE
R01UH0384EJ0311 Rev. 3.11 546
Dec 22, 2016
Figure 19-2. Format of User Option Byte (000C1H)
Address: 000C1H
7 6 5 4 3 2 1 0
1 1 1 PORTSELB SPORS1 SPORS0 1 1
• Setting of SPOR detection voltage
Detection voltage (VSPOR) Option byte setting value
Rising edge Falling edge SPORS1 SPORS0
4.28 V 4.20 V 0 0
2.90 V 2.84 V 0 1
2.57 V 2.52 V 1 0
2.16 V 2.11 V 1 1
• P125/KR1/RESET pin control
PORTSELB P125/KR1/RESET pin control
0 Port function (P125/KR1)
1 RESET input (internal pull-up resistor can be always connected.)
Cautions 1. Be sure to write 1 to bits 7 to 5, 1, and 0.
2. Set the detection voltage (V
SPOR) to be within the operating voltage range. The operating
voltage range depends on the setting of the user option byte (000C2H).
The operating voltage ranges are as follows.
For CPU operating frequencies from 1 MHz to 20 MHz: V
DD = 2.7 to 5.5 V
For CPU operating frequencies from 1 MHz to 5 MHz: V
DD = 2.0 to 5.5 V
Remarks 1. For details on the SPOR circuit, see CHAPTER 18 SELECTABLE POWER-ON-RESET
CIRCUIT.
2. The detection voltage is a typical value. For details, see 24.6.4 SPOR circuit characteristics.
Figure 19-3. Format of User Option Byte (000C2H)
Address: 000C2H
7 6 5 4 3 2 1 0
1 1 1 1 1 FRQSEL2 FRQSEL1 FRQSEL0
FRQSEL2 FRQSEL1 FRQSEL0 Frequency of the high-speed on-chip oscillator
Operating frequency (fMAIN) Operating voltage range (VDD)
0 0 1
20 MHz 2.7 V to 5.5 V
0 1 0
10 MHz
0 1 1
5 MHz 2.0 V to 5.5 V
Note
1 0 0
2.5 MHz
1 0 1
1.25 MHz
Other than above
Setting prohibited
Note Use this product within the voltage range from 2.25 to 5.5 V because the detection voltage (VSPOR) of
the selectable power-on-reset (SPOR) circuit should also be considered.
Caution Be sure to write 1 to bits 7 to 3.
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