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RL78/G1A CHAPTER 24 OPTION BYTE
Figure 24-3. Format of Option Byte (000C2H/010C2H)
Address: 000C2H/010C2H
Note
7 6 5 4 3 2 1 0
CMODE1 CMODE0 1 0 FRQSEL3 FRQSEL2 FRQSEL1 FRQSEL0
Setting of flash operation mode CMODE1 CMODE0
Operating
frequency range
Operating voltage
range
0 0
LV (low voltage main) mode 1 to 4 MHz 1.6 to 3.6 V
1 0
LS (low speed main) mode 1 to 8 MHz 1.8 to 3.6 V
1 to 16 MHz 2.4 to 3.6 V
1 1
HS (high speed main) mode
1 to 32 MHz 2.7 to 3.6 V
Other than above
Setting prohibited
FRQSEL3 FRQSEL2 FRQSEL1 FRQSEL0 Frequency of the high-speed on-chip oscillator
1 0 0 0
32 MHz
0 0 0 0
24 MHz
1 0 0 1
16 MHz
0 0 0 1
12 MHz
1 0 1 0
8 MHz
0 0 1 0
6 MHz
1 0 1 1
4 MHz
0 0 1 1
3 MHz
1 1 0 0
2 MHz
1 1 0 1
1 MHz
Other than above Setting prohibited
Note Set the same value as 000C2H to 010C2H when the boot swap operation is used because 000C2H is replaced
by 010C2H.
Cautions 1. Be sure to set bits 4 and 5 to “10B”.
2. The ranges of operation frequency and operation voltage vary depending on the flash operation
mode. For details, see 29.4 or 30.4 AC Characteristics.
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R01UH0305EJ0200 Rev.2.00 797
Jul 04, 2013