RL78/D1A User's Manual: Hardware - Renesas

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Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 23 POWER-ON-RESET CIRCUIT Checking reset source Figure 23-3. Example of Software Processing After Reset Release (2/2) Check reset source TRAP of RESF register = 1? No WDTRF of RESF register = 1? No RPERF of RESF register = 1? No IAWRF of RESF register = 1? No LVIRF of RESF register = 1? No Power-on-reset/external reset generated Yes Yes Yes Yes Yes Reset processing by illegal instruction execution Note Reset processing by watchdog timer Reset processing by RAM parity error Reset processing by illegal-memory access Reset processing by voltage detector Note The illegal instruction is generated when instruction code FFH is executed. Reset by the illegal instruction execution not issued by emulation with the in-circuit emulator or on-chip debug emulator. R01UH0317EJ0004 Rev. 0.04 1113 Feb. 22, 2013
Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 24 VOLTAGE DETECTOR 24.1 Functions of Voltage Detector The voltage detector (LVD) has the following functions. CHAPTER 24 VOLTAGE DETECTOR The LVD circuit compares the supply voltage (VDD) with the detection voltage (VLVDH, VLVDL), and generates an internal reset or internal interrupt signal. The detection level for the power supply detection voltage (VLVDH, VLVDL) can be selected by using the option byte as one of 6 levels (For details, see CHAPTER 27 OPTION BYTE). Operable in STOP mode. The following three operation modes can be selected by using the option byte. (a) Interrupt & reset mode (option byte LVIMDS1, LVIMDS0 = 1, 0) For the two detection voltages selected by the option byte 000C1H/020C1H, the high-voltage detection level (VLVDH) is used for generating interrupts and ending resets, and the low-voltage detection level (VLVDL) is used for triggering resets. (b) Reset mode (option byte LVIMDS1, LVIMDS0 = 1, 1) The detection voltage (VLVD) selected by the option byte 000C1H/020C1H is used for triggering and ending resets. (c) Interrupt mode (option byte LVIMDS1, LVIMDS0 = 0, 1) The detection voltage (VLVD) selected by the option byte 000C1H/020C1H is used for generating interrupts/reset release. Two detection voltages (VLVDH, VLVDL) can be specified in the interrupt & reset mode, and one (VLVD) can be specified in the reset mode and interrupt mode. The reset and interrupt signals are generated as follows according to the option byte (LVIMDS0, LVIMDS1) selection. Interrupt & reset mode (LVIMDS1, LVIMDS0 = 1, 0) Generates an internal interrupt signal when VDD < VLVDH, and an internal reset when VDD < VLVDL. Releases the reset signal when VDD VLVDH. Reset mode (LVIMDS1, LVIMDS0 = 1, 1) Generates an internal reset signal when VDD < VLVD and releases the reset signal when VDD VLVD. Interrupt mode (LVIMDS1, LVIMDS0 = 0, 1) Generates an internal interrupt signal when VDD drops lower than VLVD (VDD < VLVD) or when VDD becomes VLVD or higher (VDD VLVD). Releases the reset signal when VDD VLVD at power on. While the voltage detector is operating, whether the supply voltage or the input voltage from an external input pin is more than or less than the detection level can be checked by reading the voltage detection flag (LVIF: bit 0 of the voltage detection register (LVIM)). Bit 0 (LVIRF) of the reset control flag register (RESF) is set to 1 if reset occurs. For details of the RESF register, see CHAPTER 22 RESET FUNCTION. R01UH0317EJ0004 Rev. 0.04 1114 Feb. 22, 2013
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User’s Manual 16 RL78/D1A 16-Bit
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NOTES FOR CMOS DEVICES (1) VOLTAGE
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Conventions Data significance: High
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CONTENTS CHAPTER 1 OUTLINE.........
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3.4.4 Short direct addressing .....
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6.8 Operation of Plural Channels of
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RL78/D1A User’s Manual: Hardware
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