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C8051F300 Datasheet(PDF) 19 Page - List of Unclassifed Manufacturers |
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C8051F300 Datasheet(HTML) 19 Page - List of Unclassifed Manufacturers |
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19 / 174 page  C8051F300/1/2/3/4/5 Rev. 2.6 19 1.1.3. Additional Features The C8051F300/1/2/3/4/5 SoC family includes several key enhancements to the CIP-51 core and periph- erals to improve performance and ease of use in end applications. The extended interrupt handler provides 12 interrupt sources into the CIP-51 (as opposed to 7 for the stan- dard 8051), allowing numerous analog and digital peripherals to interrupt the controller. An interrupt driven system requires less intervention by the MCU, giving it more effective throughput. The extra interrupt sources are very useful when building multitasking, real-time systems. Eight reset sources are available: power-on reset circuitry (POR), an on-chip VDD monitor (forces reset when power supply voltage drops below 2.7 V), a Watchdog Timer, a Missing Clock Detector, a voltage level detection from Comparator0, a forced software reset, an external reset pin, and an illegal Flash read/write protection circuit. Each reset source except for the POR, Reset Input Pin, or Flash protection may be disabled by the user in software. The WDT may be permanently enabled in software after a power- on reset during MCU initialization. The internal oscillator is available as a factory calibrated 24.5 MHz ±2% (C8051F300/1 devices); an uncal- ibrated version is available on C8051F302/3/4/5 devices. On all C8051F300/1/2/3/4/5 devices, the internal oscillator period may be user programmed in ~0.5% increments. An external oscillator drive circuit is also included, allowing an external crystal, ceramic resonator, capacitor, RC, or CMOS clock source to generate the system clock. If desired, the system clock source may be switched on-the-fly to the external oscillator circuit. An external oscillator can be extremely useful in low power applications, allowing the MCU to run from a slow (power saving) external crystal source, while periodically switching to the fast (up to 25 MHz) internal oscillator as needed. Figure 1.4. On-Chip Clock and Reset PCA WDT Missing Clock Detector (one- shot) (Software Reset) System Reset Reset Funnel P0.x P0.y EN SWRSF Internal Oscillator System Clock CIP-51 Microcontroller Core Extended Interrupt Handler Clock Select EN XTAL1 XTAL2 External Oscillator Drive Illegal FLASH Operation + - Comparator 0 C0RSEF /RST (wired-OR) Power On Reset + - VDD Supply Monitor Enable '0' |
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