Chapter 4
Clock/ Mode/ Voltage Control
IV - 26 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,
Frequency and Mode
4.3.2 Register List
Table:4.3.2 shows a list of power supply control registers.
Table:4.3.2 Power Supply Control Registers
R/W: Readable/Writable
√: Enable, -: Setting is prohibited.
VDD30
Operating power
supply range [V]
Maximum
operating
frequency
VDD18
Output voltage [V]
Operating mode
NORMAL SLOW
HALT0/2
STOP0
HALT1/3
STOP1
1.1 to 3.6 40 kHz 1.1 - √ *2 - √ *2
1.3 to 3.6 1 MHz 1.3 √ *1 √ *2 √ *1 √ *2
1.8 to 3.6 10 MHz 1.8 √√ *2 √√ *2
*1 f
SYSCLK
(or f
HCLK
) ≤ 1 MHz
*2 16 kHz ≤ f
SYSCLK
≤ 40 kHz, 32 kHz ≤ f
SCLK
≤ 40 kHz
Symbol Address R/W Register name Page
PWCTR0 0x03F6C R/W Power supply control register 0 IV-27
PWCTR1 0x03F6D R/W Power supply control register 1 IV-28
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