UART/IrDA/CIR Basic Programming Model
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19.4.2 IrDA Programming Model
19.4.2.1 SIR Mode
19.4.2.1.1 Receive
The following programming model explains how to program the module to receive an IrDA frame with
parity forced to 1, baud rate = 112.5KB, FIFOs disabled, 2 stop-bits, and 8-bit word length:
1. Disable the UART before accessing the UARTi.UART_DLL and UARTi.UART_DLH registers:
Set the UARTi.UART_MDR1[2:0] MODE_SELECT bit field to 0x7.
2. Grant access to the UART_DLL and UART_DLH registers (the UART_LCR[7] DIV_EN bit = 1):
UARTi.UART_LCR = 0x80 (Data format is unaffected by the use and settings of the
UARTi.UART_LCR register in IrDA mode.)
3. Load the new baud rate (115.2 kbps):
UARTi.UART_DLL = 0x1A
UARTi.UART_DLH = 0x00
4. Set SIR mode:
UARTi.UART_MDR1[2:0] MODE_SELECT = 0x1
5. Disable access to the UART_DLL and UART_DLH registers and switch to register operational mode:
UARTi.UART_LCR = 0x00.
6. Optional: Enable the RHR interrupt:
UARTi.UART_IER[0] RHR_IT = 0x1
19.4.2.1.2 Transmit
The following programming model explains how to program the module to transmit an IrDA 6-byte frame
with no parity, baud rate = 112.5 kbps, FIFOs disabled, 3/16 encoding, 2 stop-bits, and 7-bit word length:
1. Disable the UART before accessing the UARTi.UART_DLL and UARTi.UART_DLH registers:
Set the UART_MDR1[2:0] MODE_SELECT bit field to 0x7.
2. Grant access to the UART_EFR register:
UARTi.UART_LCR = 0xBF
3. Enable the enhanced features (the UART_EFR[4] ENAHNCED_EN bit = 1):
Set the UARTi.UART_EFR register value to 0x10.
4. Grant access to the UART_DLL and UART_DLH registers (the UART_LCR[7] DIV_EN bit = 1):
UARTi.UART_LCR = 0x80 (Data format is unaffected by the use and settings of the
UARTi.UART_LCR register in IrDA mode.)
5. Load the new baud rate (115.2 kbps):
UARTi.UART_DLL = 0x1A
UARTi.UART_DLH = 0x00
6. Set SIR mode (the UART_MDR1[2:0] MODE_SELECT bit field = 0x1):
UARTi.UART_MDR1 = 0x01
7. Disable access to the UART_DLL and UART_DLH registers and switch to register operational mode:
UARTi.UART_LCR = 0x00.
8. Force DTR output to active:
UARTi.UART_MCR[0] DTR = 1
9. Optional: Enable the THR interrupt:
UARTi.UART_IER[1] THR_IT = 1
10. Set transmit frame length to 6 bytes:
UARTi.UART_TXFLL = 0x06
11. Set 7 starts of frame transmission:
UARTi.UART_EBLR = 0x08
12. Optional: Set SIR pulse width to be 1.6 us:
UARTi.UART_ACREG[7] PULSE_TYPE = 1
13. Load the UART_THR register with the data to be transmitted.
3502
Universal Asynchronous Receiver/Transmitter (UART) SPRUH73H–October 2011–Revised April 2013
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