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RL78/D1A User's Manual: Hardware - Renesas

RL78/D1A User's Manual: Hardware - Renesas

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Under development<br />

Preliminary document<br />

Specifications in this document are tentative and subject to change.<br />

<strong>RL78</strong>/<strong>D1A</strong> CHAPTER 27 OPTION BYTE<br />

27.1 Functions of Option Bytes<br />

CHAPTER 27 OPTION BYTE<br />

Addresses 000C0H to 000C3H of the flash memory of the <strong>RL78</strong>/<strong>D1A</strong> form an option byte area.<br />

Option bytes consist of user option byte (000C0H to 000C2H) and on-chip debug option byte (000C3H).<br />

Upon power application or resetting and starting, an option byte is automatically referenced and a specified function is<br />

set. When using the product, be sure to set the following functions by using the option bytes.<br />

To use the boot swap operation during self programming, 000C0H to 000C3H are replaced by 020C0H to 020C3H.<br />

Therefore, set the same values as 000C0H to 000C3H to 020C0H to 020C3H.<br />

27.1.1 User option byte (000C0H to 000C2H/020C0H to 020C2H)<br />

(1) 000C0H/020C0H<br />

Operation of watchdog timer<br />

Operation is stopped or enabled in the HALT or STOP mode.<br />

Setting of interval time of watchdog timer<br />

Operation of watchdog timer<br />

Operation is stopped or enabled.<br />

Setting of window open period of watchdog timer<br />

Setting of interval interrupt of watchdog timer<br />

Used or not used<br />

Caution Set the same value as 000C0H to 020C0H when the boot swap operation is used because<br />

000C0H is replaced by 020C0H.<br />

(2) 000C1H/020C1H<br />

Setting of LVD operation mode<br />

Interrupt & reset mode.<br />

Reset mode.<br />

Interrupt mode.<br />

Setting of LVD detection level (VLVDH, VLVDL, VLVD)<br />

Caution Set the same value as 000C1H to 020C1H when the boot swap operation is used because<br />

000C1H is replaced by 020C1H.<br />

R01UH0317EJ0004 Rev. 0.04 1152<br />

Feb. 22, 2013

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