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Chapter 4
Clock/ Mode/ Voltage Control
4.3 Voltage Control
4.3.1
Overview
The LSI has 3 kinds of power supply voltage; 1.1 V, 1.3 V, and 1.8 V. Depending on the operating supply voltage,
operating frequency, and target value of power consumption, power supply voltage is selected and supplied to
CPU, the peripheral function, RAM, and ReRAM.
The relation of the output voltage, VDD18 to operating power supply voltage, operating frequency, and operating
mode is shown in the table below.
Table:4.3.1 Relation of Output Voltage, VDD18 to Operating Power Supply Voltage,
VDD30
Operating power
supply range [V]
1.1 to 3.6
1.3 to 3.6
1.8 to 3.6
*1 f
(or f
SYSCLK
HCLK
*2 16 kHz ≤ f
SYSCLK
4.3.2
Register List
Table:4.3.2 shows a list of power supply control registers.
Symbol
PWCTR0
PWCTR1
R/W: Readable/Writable
IV - 26
Voltage Control
Frequency and Mode
Maximum
operating
Output voltage [V]
frequency
40 kHz
1 MHz
10 MHz
) ≤ 1 MHz
≤ 40 kHz, 32 kHz ≤ f
SCLK
Table:4.3.2 Power Supply Control Registers
Address
R/W
0x03F6C
R/W
Power supply control register 0
0x03F6D
R/W
Power supply control register 1
VDD18
NORMAL
1.1
-
√ *1
1.3
√
1.8
≤ 40 kHz
Register name
√: Enable, -: Setting is prohibited.
Operating mode
HALT0/2
HALT1/3
SLOW
STOP0
√ *2
-
√ *2
√ *1
√ *2
√
STOP1
√ *2
√ *2
√ *2
Page
IV-27
IV-28
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