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說(shuō)明書忘了看，復(fù)制了一段英文：
Features
• Processor
– ARM Cortex-M0+ CPU running at up to 48MHz
• Single-cycle hardware multiplier
• Micro Trace Buffer (MTB)
• Memories
– 32/64/128/256KB in-system self-programmable Flash
– 4/8/16/32KB SRAM Memory
• System
– Power-on reset (POR) and brown-out detection (BOD)
– Internal and external clock options with 48MHz Digital Frequency
Locked Loop (DFLL48M) and 48MHz to 96MHz Fractional Digital
Phase Locked Loop (FDPLL96M)
– External Interrupt Controller (EIC)
– 16 external interrupts
– One non-maskable interrupt
– Two-pin Serial Wire Debug (SWD) programming, test and
debugging interface
• Low Power
– Idle and standby sleep modes
– SleepWalking peripherals
Atmel-42181J-SAM D21_Datasheet_Complete-07/2016
• Peripherals
– 12-channel Direct Memory Access Controller (DMAC)
– 12-channel Event System
– Up to five 16-bit Timer/Counters (TC), configurable as either:
• One 16-bit TC with two compare/capture channels
• One 8-bit TC with two compare/capture channels
• One 32-bit TC with two compare/capture channels, by using two TCs
– Three 24-bit Timer/Counters for Control (TCC), with extended functions:
• Up to four compare channels with optional complementary output
• Generation of synchronized pulse width modulation (PWM) pattern across port pins
• Deterministic fault protection, fast decay and configurable dead-time between
complementary output
• Dithering that increase resolution with up to 5 bit and reduce quantization error
– 32-bit Real Time Counter (RTC) with clock/calendar function
– Watchdog Timer (WDT)
– CRC-32 generator
– One full-speed (12Mbps) Universal Serial Bus (USB) 2.0 interface
• Embedded host and device function
• Eight endpoints
– Up to six Serial Communication Interfaces (SERCOM), each configurable to operate as
either:
• USART with full-duplex and single-wire half-duplex configuration
• I2C up to 3.4MHz
• SPI
• LIN slave
– One two-channel Inter-IC Sound (I 2 S) interface
– One 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to 20 channels
• Differential and single-ended input
• 1/2x to 16x programmable gain stage
• Automatic offset and gain error compensation
• Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution
– 10-bit, 350ksps Digital-to-Analog Converter (DAC)
– Two Analog Comparators (AC) with window compare function
– Peripheral Touch Controller (PTC)
• 256-Channel capacitive touch and proximity sensing
它們說(shuō)的特征是SAM D21E / SAM D21G / SAM D21J，ADC12位、350ksps應(yīng)該是指這些，我不太會(huì)看英文說(shuō)明書
附鏈接：(請(qǐng)手工把點(diǎn)替換成.)files.seeedstudio點(diǎn)com/wiki/Seeeduino-XIAO/res/ATSAMD21G18A-MU-Datasheet.pdf
ADC描述位于第863頁(yè)
要描述屬實(shí)，adc采樣率挺不錯(cuò)。。。淘寶賣模數(shù)轉(zhuǎn)換器ads1015 12位采樣率3300SPS，價(jià)格18~25元一小片，這SAMD21G18集成了ad、da、48MHZ主頻、256kb等，作為arduino硬件，它的價(jià)格38~45挺便宜了 嗯，和隔壁百元STM開發(fā)板比較的
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