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R7FS3A6783A01CFM Datasheet(PDF) 6 Page - Renesas Technology Corp |
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R7FS3A6783A01CFM Datasheet(HTML) 6 Page - Renesas Technology Corp |
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6 / 129 page  R01DS0308EU0100 Rev.1.00 Page 6 of 129 Apr 4, 2017 S3A6 Group MCUs 1. Overview Table 1.3 System (1 of 2) Feature Functional description Operating mode Two operating modes: - Single-chip mode - SCI/USB boot mode. See section 3, Operating Modes in User’s Manual. Reset 14 types of resets: RES pin reset Power-on reset VBATT selected voltage power on reset Independent watchdog timer reset Watchdog timer reset Voltage monitor 0 reset Voltage monitor 1 reset Voltage monitor 2 reset SRAM parity error reset SRAM ECC error reset Bus master MPU error reset Bus slave MPU error reset Stack pointer error reset Software reset. See section 5, Resets in User’s Manual. Low Voltage Detection (LVD) The Low Voltage Detection (LVD) monitors the voltage level input to the VCC pin, and the detection level can be selected using a software program. See section 7, Low Voltage Detection (LVD) in User’s Manual. Clock Main clock oscillator (MOSC) Sub-clock oscillator (SOSC) High-speed on-chip oscillator (HOCO) Middle-speed on-chip oscillator (MOCO) Low-speed on-chip oscillator (LOCO) PLL frequency synthesizer Independent watchdog timer on-chip oscillator Clock out support. See section 8, Clock Generation Circuit in User’s Manual. Clock Frequency Accuracy Measurement Circuit (CAC) The Clock Frequency Accuracy Measurement Circuit (CAC) is used to check the system clock frequency with a reference clock signal by counting the number of pulses of the system clock to be measured. The reference clock can be provided externally through a CACREF pin or internally from various on-chip oscillators. Event signals can be generated when the clock does not match or measurement ends. This feature is particularly useful in implementing a fail-safe mechanism for home and industrial automation applications. See section 9, Clock Frequency Accuracy Measurement Circuit (CAC) in User’s Manual. Interrupt Controller Unit (ICU) The Interrupt Controller Unit (ICU) controls which event signals are linked to the NVIC/DTC module and DMAC module. The ICU also controls NMI interrupts. See section 13, Interrupt Controller Unit (ICU) in User's Manual. Key Interrupt Function (KINT) A key interrupt can be generated by setting the Key Return Mode register (KRM) and inputting a rising or falling edge to the key interrupt input pins. See section 20, Key Interrupt Function (KINT) in User's Manual. Low Power Mode Power consumption can be reduced in multiple ways, including setting clock dividers, stopping modules, selecting power control mode in normal operation, and transitioning to low power modes. See section 10, Low Power Modes in User's Manual. Battery Backup Function A battery backup function is provided for partial powering by a battery. The battery powered area includes RTC, SOSC, LOCO, Wakeup Control, Backup Memory, VBATT_R Low Voltage Detection, and switch between VCC and VBATT. During normal operation, the battery powered area is powered by the main power supply, the VCC pin. When a VCC voltage drop is detected, the power source is switched to the dedicated battery backup power pin, the VBATT pin. When the voltage rises again, the power source is switched from the VBATT pin to the VCC pin. See section 11, Battery Backup Function in User's Manual. Register Write Protection The register write protection function protects important registers from being overwritten due to software errors. See section 12, Register Write Protection in User's Manual. |
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