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Renesas RL78/G14 Application Note
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Renesas RL78/G14 Application Note

Renesas RL78/G14 Application Note

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APPLICATION NOTE
RL78/G14, R8C/36M Group
R01AN1386EJ0100
Rev. 1.00
Jan. 18, 2013
Migration Guide from R8C to RL78: Clock Generator
Abstract
This document describes how to migrate from the R8C/36M Group clock generation circuit to the RL78/G14 clock
generator.
Products
RL78/G14, R8C/36M Group
When using this application note with other Renesas MCUs, careful evaluation is recommended after making
modifications to comply with the alternate MCU.
R01AN1386EJ0100 Rev. 1.00
Page 1 of 10
Jan. 18, 2013

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Summary of Contents for Renesas RL78/G14

  • Page 1 Rev. 1.00 Jan. 18, 2013 Migration Guide from R8C to RL78: Clock Generator Abstract This document describes how to migrate from the R8C/36M Group clock generation circuit to the RL78/G14 clock generator. Products RL78/G14, R8C/36M Group When using this application note with other Renesas MCUs, careful evaluation is recommended after making modifications to comply with the alternate MCU.

  • Page 2: Table Of Contents

    RL78/G14, R8C/36M Group Migration Guide from R8C to RL78: Clock Generator Contents Differences between the R8C/36M Group and RL78/G14 ..............3 XIN Clock Oscillation Circuit ......................5 High-speed On-chip Oscillator ..................... 6 XCIN Clock Oscillation Circuit ...................... 7 Low-speed On-chip Oscillator ...................... 8 Terms..............................

  • Page 3: Differences Between The R8C/36M Group And Rl78/G14

    Migration Guide from R8C to RL78: Clock Generator Differences between the R8C/36M Group and RL78/G14 Table 1.1 and Table 1.2 list the specification overview of the R8C/36M Group clock generation circuit and RL78/G14 clock generator. Table 1.3 lists the differences between the R8C/36M Group clock generation circuit and RL78/G14 clock generator.

  • Page 4: High-Speed On-Chip Oscillator

    RL78/G14, R8C/36M Group Migration Guide from R8C to RL78: Clock Generator Table 1.2 Overview of the Clock Generator Specifications for the RL78/G14 Item Main System Clock Subsystem Clock Low-speed Oscillator On-chip High-speed High-speed On-chip Oscillator System Clock Oscillator Oscillator • CPU clock •...
  • Page 5 RL78/G14, R8C/36M Group Migration Guide from R8C to RL78: Clock Generator Table 1.3 Differences in the Clock Generator Item R8C/36M Group RL78/G14 High-speed on-chip oscillator ±1.5% ±1% accuracy How to adjust the high-speed on- 40 MHz: FRA1 = value after reset,...
  • Page 6 Migration Guide from R8C to RL78: Clock Generator Clocks generated by the RL78/G14 high-speed system clock oscillator can be used as the clock source for the CPU clock or the peripheral function clock. To use the high-speed system clock oscillator, connect a crystal resonator or ceramic oscillator to pins X1 and X2.

  • Page 7: Xcin Clock Oscillation Circuit

    RL78/G14, R8C/36M Group Migration Guide from R8C to RL78: Clock Generator Clocks generated by the RL78/G14 high-speed on-chip oscillator can be used as the clock source for the CPU clock or the peripheral function clock. The f oscillating frequency can be specified as 64, 48, 32, 24, 16, 12, 8, 4, or 1 MHz HOCO by setting the user option byte.

  • Page 8: Low-Speed On-Chip Oscillator

    Migration Guide from R8C to RL78: Clock Generator Clocks generated by the RL78/G14 XT1 oscillator can be used as the clock source for the CPU clock or the peripheral function clock. The power consumption and oscillation margin for the XT1 oscillator can be adjusted by selecting the oscillation mode.

  • Page 9: Terms

    12-bit interval timer, or timer RJ. It cannot be used as the clock source for the CPU clock. After a reset is released, the RL78/G14 low-speed on-chip oscillator stops when bit 4 (WDTON) in the option byte (000C0H) is 0, or oscillates when bit 4 in the option byte is 1.

  • Page 10: Reference Documents

    User’s Manual: Hardware RL78/G14 User’s Manual: Hardware Rev.1.00 R8C/36M Group User’s Manual: Hardware Rev.1.01 The latest versions can be downloaded from the Renesas Electronics website. Technical Update/Technical News The latest information can be downloaded from the Renesas Electronics website. Website and Support Renesas Electronics website http://www.renesas.com...
  • Page 11 RL78/G14, R8C/36M Group REVISION HISTORY Migration Guide from R8C to RL78: Clock Generator Description Rev. Date Page Summary 1.00 Dec. 28, 2012 — First edition issued All trademarks and registered trademarks are the property of their respective owners.
  • Page 12 General Precautions in the Handling of MPU/MCU Products The following usage notes are applicable to all MPU/MCU products from Renesas. For detailed usage notes on the products covered by this manual, refer to the relevant sections of the manual. If the descriptions under General Precautions in the Handling of MPU/MCU Products and in the body of the manual differ from each other, the description in the body of the manual takes precedence.
  • Page 13 10. It is the responsibility of the buyer or distributor of Renesas Electronics products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the contents and conditions set forth in this document, Renesas Electronics assumes no responsibility for any losses incurred by you or third parties as a result of unauthorized use of Renesas Electronics products.

This manual is also suitable for:

R8c/36m