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14.4 Control Register
(1) Regulator control register (REGC)
The REGC register controls the operation of the regulator.
This register can be read/written in 8-bit or 1-bit units.
Cautions 1. Change the value of the REGC register only once after the system has been reset for
system stabilization.
2. Make sure that the pins are set as follows when the REGC0 bit = 1 (when the regulator is
stopped).
• REGOUT pin: Leave open
• REGIN pin:
3. Also make sure that the pins are set as follows when the REGC0 bit = 0 (regulator
operating) (for details of the connection method, refer to 14.3 Connection Example).
• REGOUT pin: Connect this pin to the base of the external transistor.
• REGIN pin:
• Connect a bias resistor between the base and emitter of the external transistor.
7
6
REGC
0
0
Bit position
Bit name
0
REGC0
602
CHAPTER 14 REGULATOR
Supply 3.3 V (3.0 to 3.6 V) to this pin.
Connect this pin to the emitter of the external transistor and to an
electrolytic capacitor.
5
4
3
0
0
0
Controls the operation of the regulator.
0: Regulator operates.
1: Regulator stops.
User's Manual U15195EJ5V0UD
2
1
0
0
0
REGC0
FFFFF300H
Function
Address
After reset
00H
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