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RX230 Group, RX231 Group
2.3 Clock Settings
Table 2.2, Clock Settings, lists the clocks used by the sample program.
Name
Main clock
Subclock
High-speed on-chip oscillator (HOCO)
Low-speed on-chip oscillator (LOCO)
IWDT on-chip oscillator
PLL circuit
USB clock
System clock (ICLK)
Peripheral clock A (PCLKA)
Peripheral clock B (PCLKB)
Peripheral clock D (PCLKD)
Flash interface clock (FCLK)
2.4 LCD Panel
The LCD panel (Pmod specification) included with the RSK is used.
2.5 Hardware Modifications
To confirm the operation of the sample program, modifications were made to the RSK to enable battery
backup operation.
2.5.1 VBATT Connection
The RX231 RSK board is provided with jumper J10 to allow confirming operation of the battery backup
function. However, jumper J10 is not mounted on the board when it is shipped from the factory and VBATT
pin is connected to VCC by resistor R86. It is therefore necessary to make the following modifications.
1. Remove resistor R86.
2. Solder resistor R85 to the board.
3. Solder a pin header (two-pin) to the board in the jumper J10 location.
For reference when performing modifications, see Figure 2.2, Excerpt from RSKRX231 User's Manual, and
Figure 2.3, VBATT Circuit Detail Excerpted from RSKRX231 CPU Board Schematics.
R01AN4831EJ0100 Rev.1.00
Aug.20.19
Initial Settings and Usage Procedure of RTC Battery Backup Function
Table 2.2 Clock Settings
Operating
Clock
Frequency
Source
8 MHz
Implemented
externally
32.768 kHz
Implemented
externally
⎯
Stopped
⎯
Stopped
⎯
Stopped
54 MHz
Main clock
48 MHz
Main clock
54 MHz
PLL
54 MHz
PLL
27 MHz
PLL
27 MHz
PLL
27 MHz
PLL
Frequency
Multiplication
Dividing Ratio
Factor
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
2
13.5
2
12
⎯
1
⎯
1
⎯
2
⎯
2
⎯
2
Page 10 of 23
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