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STATUS, RPO ; RCSTA ^ 0x080, SPEN STATUS, RPO TXSTA, TX9 ; TXSTA, TXEN ; STATUS, RPO
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SPEN Set to enable the USART. RX9 Set to enable 9-bit USART receive. SREN Set to enable single-byte synchronous data receive; reset when data has been received. CREN Set to enable continuous receive. ADDEN Set to receive data address information; may be unused in many PIC microcontroller part numbers. FERR Framing error bit. OERR Overrun error bit. RX9D Received ninth bit.
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ANALOG I/O
To send a byte in WREG, use the following code:
btfss goto movwf TXSTA, TRMT $ - 1 TXREG
; ; ; ; ;
Wait for Holding Register to become Free/Empty Load Holding Register When the Transmit Shift Register is Empty, byte will be sent
In the data send code, the TRMT bit, which indicates when the TX holding register is empty, is polled. When the register is empty, the next byte to send is put into the transmit shift register. This polling loop can be eliminated by setting the TXIE bit in the interrupt control register and then in your interrupt handler, checking to see if the TXIF ag is set before saving a byte in TXREG. To set up an asynchronous read, the following code is used:
bsf bcf bcf movlw movwf bsf bcf STATUS, RPO TXSTA, SYNCH ; TXSTA, BRGH ; DataRate ; SPBRG RCSTA ^ 0x080, SPEN ; TCSTA ^ 0x080, RX9 ;
Want Asynch Communications Low Speed Clock Set Data Rate Enable Serial Port Eight Bits to Receive
To wait to receive data and then store the incoming byte in WREG, you can use the following code:
btfss goto movf bcf PIR1, RXIF $ - 1 RCREG, w RXIF ; ; ; ; ; Wait for a Character to be Received Get the byte Received Reset the RX byte Interrupt Request Flag
Analog I/O
Depending on your experience level, you may feel that the PIC microcontroller has quite limited analog I/O capabilities. This is especially true if you are looking for high-speed analog operation, including signal analysis. The Microchip PIC mid-range microcontrollers actually have relatively good analog I/O capabilities, although for high-speed analog I/O you may want to look at external ADCs and DACs (or even other microcontrollers or circuits) that do provide high-speed capabilities. The ADC built into the PIC microcontrollers can sample and process signals as fast as 25 kHz or so accurately. Looking at the ADC s speci cations, you might feel that the best analog signal frequency that can be processed is 50 kHz (because the examples in
PIC MCU OPTIONAL HARDWARE FEATURES
the datasheet show a 19-ms acquisition/processing time). I specify 25 kHz because of Nyquist s sampling theorem, which says that to sample an analog signal properly, you must sample at twice the highest data frequency expected in the signal. Thus 25 kHz may seem like a reasonably fast signal to sample; after all, speech only requires 2.5 kHz, and full-spectrum audio is only up to about 18 kHz. For most electronic signals, though, 25 kHz is actually quite a low speed and not very useful (e.g., the AM radio band starts at 66 kHz and NTSC monochrome composite video runs at 3.5 MHz). Along with the slow ADC sampling and processing speeds, digital signal processing (DSP) algorithms are dif cult to implement on the PIC microcontroller because of the processor s ability to interface with only 8 bits of data and lack of multiply instructions except in the PIC18. Limited DSP functions can be implemented, but they will be challenging for data input waveforms that are faster than 1 kHz or so. For these reasons, I don t recommend that the PIC microcontroller s built-in ADCs be used for anything other than measuring dc voltages. With up to 12 bits available with built-in ADCs, the PIC microcontroller is very well suited for making accurate measurement of dc analog voltages. Personally, I nd the Microchip documentation to be quite complex and dif cult to gure out how to use the built-in ADC hardware for applications. In the following sections I ll go through how the analog input and processing works on the PIC microcontroller, and I provide some hints for using the features without having to wade through all the documentation.
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