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S3A7 データシート(PDF) 3 Page - Renesas Technology Corp |
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S3A7 データシート(HTML) 3 Page - Renesas Technology Corp |
3 / 133 page R01DS0263EU0100 Rev.1.00 Page 3 of 130 Feb 23, 2016 S3A7 1. Overview Table 1.3 System (1/2) 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 This MCU has 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 6, 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 8, 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 9, 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 10, Clock Frequency Accuracy Measurement Circuit (CAC) in User's Manual. Low Power Mode This MCU has several functions for reducing power consumption, such as setting clock dividers, controlling EBCLK output, stopping modules, selecting power control mode in normal operation, and transitioning to low power modes. See section 11, Low Power Mode in User's Manual. Battery Backup Function This MCU has a battery backup function that can be partly powered by a battery. The battery powered area includes RTC/AGT/SOSC/LOCO/Wakeup Control/Backup Memory/VBATT_R Low Voltage Detection/Switch between VCC/VBATT. During normal operation, the battery powered area is powered by the main power supply which is 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 12, 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 13, Register Write Protection in User's Manual. Memory Protection Unit (MPU) This MCU incorporates two memory protection units and provide a CPU stack pointer monitor function. See section 16, Memory Protection Unit (MPU) in User's Manual. |
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同様の説明 - S3A7 |
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