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ATTINY817-MFR. Datasheet(PDF) 62 Page - Microchip Technology |
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ATTINY817-MFR. Datasheet(HTML) 62 Page - Microchip Technology |
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62 / 492 page  The Error is stored as a compressed Q1.10 fixed point 8 bit value, in order not to lose resolution, where the MSB is the sign bit and the 7 LSBs the lower bits of the Q.10. BAUDact������= BAUD����������+BAUD����������*���������������������� 1024 The minimum legal BAUD register value is 0x40, the target BAUD register value should therefor not be lower than 0x4A to ensure that the compensated BAUD value stays within the legal range, even for parts with negative compensation values. The example code below, demonstrates how to apply this value for more accurate USART baud rate: #include <assert.h> /* Baud rate compensated with factory stored frequency error */ /* Asynchronous communication without Auto-baud (Sync Field) */ /* 16MHz Clock, 3V and 600 BAUD */ int8_t sigrow_val = SIGROW.OSC16ERR3V; // read signed error int32_t baud_reg_val = 600; // ideal BAUD register value assert (baud >= 0x4A); // Verify legal min BAUD register value with max neg comp baud_reg_val *= (1024 + sigrow_value); // sum resolution + error baud_reg_val /= 1024; // divide by resolution USART0.BAUD = (int16_t) baud_reg_val; // set adjusted baud rate Related Links Oscillators and Clocks 32KHz Oscillator (OSCULP32K) The 32KHz oscillator is optimized for Ultra Low Power (ULP) operation. Power consumption is decreased at the cost of decreased accuracy compared to an external crystal oscillator. This oscillator also provides the 1KHz signal for the Real Time Counter (RTC), the Watchdog Timer (WDT), and the Brownout Detector (BOD). The start-up time of this oscillator is the oscillator start-up time plus 4 oscillator cycles. Refer to Electrical Characteristics chapter for the start-up time. Related Links BOD - Brownout Detector WDT - Watchdog Timer RTC - Real Time Counter 10.3.4.2 External Clock Sources These external clock sources are available: • External clock from pin. (EXTCLK). • The TOSC1 and TOSC2 pins are dedicated to driving a 32.768kHz crystal oscillator (XOSC32K). • Instead of a crystal oscillator, TOSC1 can be configured to accept an external clock source. 32.768kHz Crystal Oscillator (XOSC32K) This oscillator supports two input options: Either a crystal is connected to the pins TOSC1 and TOSC2, or an external clock running at 32KHz is connected to TOSC1. The input option must be configured by writing the Source Select bit (SEL) in the XOSC32K Control A register (CLKCTRL.XOSC32KCTRLA). The XOSC32K is enabled by writing a '1' to its ENABLE bit in CLKCTRL.XOSC32KCTRLA. When enabled, the configuration of the GPIO pins used by the XOSC32K is overridden as TOSC1, TOSC2 pins. The Enable bit needs to be set for the oscillator to start running when requested. ATtiny417/817 © 2017 Microchip Technology Inc. Datasheet Complete DS40001901B-page 62 |
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