Renesas RL78/G13 Operation

Page 1 of 51 May 28, 2015 RL78/G13 Clock Generator (Clock Switching) CC-RL Introduction This application note explains how to use the clock generator of the RL78/G13. The clock from the clock generator is switched when a switch is pressed. The clock generator uses the high-speed on-chip oscillator clock, (32 MHz), ...

R01AN2831EJ0100 Rev. 1.00 Page 2 of 51 May 28, 2015 Contents 1. Specifications ...................................................................................................................................... 4 2. Operation Check Conditions ................................................................ ...

R01AN2831EJ0100 Rev. 1.00 Page 3 of 51 May 28, 2015 7. Documents for Reference ................................................................................................................... 51 Revision Record ................................................................................................ ...

R01AN2831EJ0100 Rev. 1.00 Page 4 of 51 May 28, 2015 1. Specifications The sample code covered in this application note switches its operating clock when the switch on the target board is pressed according to the sequence below. (1) High-speed on-chip oscillator clock (32 MHz)  X1 oscillation clock (20 MHz) ...

R01AN2831EJ0100 Rev. 1.00 Page 5 of 51 May 28, 2015 Figure 1.1 Outline of Clock Switching Switch input (INTP0) RL78/G13 Change the LED blinking period ON Change the CPU/peripheral hardware clock (fCLK) to one of the following clocks: Switch clock  HOCO clock (32 MHz)  X1 oscillation clock (20 MHz)  ...

R01AN2831EJ0100 Rev. 1.00 Page 6 of 51 May 28, 2015 2. Operation Check Conditions The sample code contained in this application note has been checked under the conditions listed in the table below. Table 2.1 Operation Check Conditions Item Description Microcontroller used RL78/G13 (R5F100LEA) Operating freq ...

R01AN2831EJ0100 Rev. 1.00 Page 7 of 51 May 28, 2015 4. Description of the Hardware 4.1 Hardware Configuration Example Figure 4.1 shows an example of hardware configuration that is used for this application note. Figure 4.1 Hardware Configuration Cautions: 1. The purpose of this circuit is only to provide th ...

R01AN2831EJ0100 Rev. 1.00 Page 8 of 51 May 28, 2015 4.2 List of Pins to be Used Table 4.1 lists the pins to be used and their functions. Table 4.1 Pins to be Used and their Functions Pin Name I/O Description P137/INTP0 Input Switch input P62 Output LED output ...

R01AN2831EJ0100 Rev. 1.00 Page 9 of 51 May 28, 2015 5. Software Description 5.1 Operation Overview The sample code covered in this application note switches its operating clock when the switch on the target board is pressed. (1) Initialize the clock generator. The sample code initializes the I/O ports, clock ...

R01AN2831EJ0100 Rev. 1.00 Page 10 of 51 May 28, 2015 5.2 File Configuration Table 5.1 lists the files that are used in this sample code. This table excludes files which are automatically generated by the integrated development environment. Table 5.1 File Configuration File Name Description Remarks r_cg_cgc. ...