Main Clock Oscillator Mode Oscillation Control Register (Momcr); Sub-Clock Oscillator Mode Control Register (Somcr) - Renesas RA4 Efficiency Series User Manual

Under development Preliminary document
Specifications in this document are tentative and subject to change
RA4W1 User's Manual
9.2.16 Main Clock Oscillator Mode Oscillation Control Register
Address(es): SYSTEM.MOMCR 4001 E413h
b7 b6
— MOSEL
Value after reset: 0 0
Bit Symbol
b2 to b0 —
b3 MODRV1
b5, b4 —
b6 MOSEL
b7 —
Note: The EXTAL/XTAL pin is also used as a port. In the initial setting state, the pin is set as a port.
Note: The MOSTP bit must be 1 (MOSC is stopped) before changing this register.
MODRV1 bit (Main Clock Oscillator Drive Capability 1
The MODRV1 bit switches the drive capability of the main clock oscillator.
MOSEL bit (Main Clock Oscillator
The MOSEL bit switches the source for the main clock oscillator.
9.2.17 Sub-Clock Oscillator Mode Control Register
Address(es): SYSTEM.SOMCR 4001 E481h
b7 b6
— —
Value after reset: 0 0
Bit Symbol
b1, b0 SODRV[1:0]
b7 to b2 —
This register must be modified when SOSCCR.SOSTP is 1 (SOSC is stopped).
SODRV[1:0] bits (Sub-Clock Oscillator Drive Capability
The SODRV[1:0] bits switch the drive capability of the sub-clock oscillator.
R01UH0883EU0050 Rev.0.50
Sep 13, 2019
b5 b4 b3 b2
MODR
— — —
V1
0 0 0 0
Bit name
Reserved
Main Clock Oscillator Drive
Capability 1 Switching
Reserved
Main Clock Oscillator Switching
Reserved
Switching)
b5 b4 b3 b2
— — — —
0 0 0 0
Bit name
Sub-Clock Oscillator Drive
Capability Switching
Reserved
b1 b0
— —
0 0
Description
These bits are read as 0. The write value should be 0.
0: 10 MHz to 20 MHz
1: 1 MHz to 10 MHz.
These bits are read as 0. The write value should be 0.
0: Resonator
1: External clock input.
This bit is read as 0. The write value should be 0.
Switching)
(SOMCR)
b1 b0
SODRV[1:0]
0 0
Description
b1 b0
0 0: Normal mode
0 1: Low power mode 1
1 0: Low power mode 2
1 1: Low power mode 3.
These bits are read as 0. The write value should be 0.
Switching)
9. Clock Generation Circuit
(MOMCR)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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