Fujitsu FR Series Application Note page 24

Chapter 3 User Clock Settings (CLOCKSPEED == CLOCK_USER)
BIT[3:2]: Reserved
BIT[1]: MAINKPEN - Main Regulator enable in STOP/RTC mode.
- 0 - Main regulator disabled in STOP/RTC mode [Initial value]
- 1 - Main regulator enabled in STOP/RTC mode
BIT[0]: MAINDSBL - Main Regulator disable in Sub-run Mode.
- 0 - Main regulator enabled in Sub-run mode [Initial value]
- 1 - Main regulator disabled in Sub-run mode
Available settings for REGULATORSEL (REGSEL):
- B'0 0 0 0 0 0 0 0
| | | | | | | |
| | | | | | | |
| | | | | | | |_____ SUBSEL0
| | | | | | |_______ SUBSEL1
| | | | | |_________ SUBSEL2
| | | | |___________ SUBSEL3
| | | |_____________ MAINSEL
| | |_______________ FLASHSEL
| |_________________ Reserved
|___________________ Reserved
BIT[7:6]: Reserved
BIT[5]: FLASHSEL - Flash memory supply mode.
- 0 - Flash memory operation mode is 1.8V [Initial value]
- 1 - Flash memory operation mode is 1.9V
BIT[4]: MAINSEL - Main Regulator supply mode.
- 0 - Main regulator operation mode is 1.8V [Initial value]
- 1 - Main regulator operation mode is 1.9V
BIT[3:0]: SUBSEL[3:0] - Sub-regulator voltage level
- 0111 - 1.9V +/- 0.1V
- 0110 - 1.8V +/- 0.1V (initial)
- 0101 - 1.7V +/- 0.1V
- 0100 - 1.6V +/- 0.1V
- 0011 - 1.5V +/- 0.1V
- 0010 - 1.4V +/- 0.1V
- 0001 - 1.3V +/- 0.1V
- 0000 - 1.2V +/- 0.1V
Note: The set level of the Sub-regulator voltage is only be effective in case of Main
Regulator is switched off. Otherwise (with main regulator on) the default level is
applied internally by hardware to the Sub-Regulator (the register setting is not
changed in this case and will be applied next time the main regulator is switched off).
Example:
Main and flash operation mode should be 1.8 V and the sub regulator voltage should be set
to 1.8 V, too.
#set REGULATORCTRL
#set REGULATORSEL
MCU-AN-300021-E-V10
Start91460.asm
0x00 ;<<< 0x4CFh: REGCTR;
0x06 ;<<< 0x4CEh: REGSEL;
- 24 - © Fujitsu Microelectronics Europe GmbH