Panasonic MN101L Series

Chapter 4
Clock/ Mode/ Voltage Control
Voltage Control IV - 27
4.3.3 Power Supply Control Register
 Power Supply Control Register 0 (PWCTR0: 0x03F6C)
The power supply control register 0 controls the switching V
DD18
output of the power supply generation circuit.
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Insert 3 NOP instructions right after the instruction to change VDD18 (write instruction to the
PWCTR0.VDDLV1-0).
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When using the instruction to change VDD18, disable the DMA transfer function.
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PWCTR0 register can be update only in SLOW mode.
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The voltage of VDD18 can be changed to match the following conditions.
- “1.1 V to 1.8 V” or “1.8 V to 1.1 V”
- “1.1 V to 1.3 V” or “1.3 V to 1.1 V”
The voltage of VDD18 must not be changed in the following conditions.
- “1.3 V to 1.8 V” or “1.8 V to 1.3 V”
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bp 76543210
Bit name
Reserved Reserved Reserved Reserved Reserved Reserved VDDLV1
VDDLV0
Initial value10000000
Access R/W R/W R/W R/W R/W R/W R/W R/W
bp Bit name Description
7-2
Reserved
Always set to "000000".
If the value other than 0 is set, this register value is not updated.
1-0 VDDLV1-0
Select output voltage, VDD18
00: 1.1 V
01: 1.3 V
10: 1.8 V
11: Setting is prohibited.