37.3.5 LPUART Match Address Register (LPUARTx_MATCH)Address: Base address + 10h offsetBit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0R 0 MA2 0 MA1WReset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0LPUARTx_MATCH field descriptionsField Description31–26ReservedThis field is reserved.This read-only field is reserved and always has the value 0.25–16MA2Match Address 2The MA1 and MA2 registers are compared to input data addresses when the most significant bit is set andthe associated BAUD[MAEN] bit is set. If a match occurs, the following data is transferred to the dataregister. If a match fails, the following data is discarded. Software should only write a MA register when theassociated BAUD[MAEN] bit is clear.15–10ReservedThis field is reserved.This read-only field is reserved and always has the value 0.MA1 Match Address 1The MA1 and MA2 registers are compared to input data addresses when the most significant bit is set andthe associated BAUD[MAEN] bit is set. If a match occurs, the following data is transferred to the dataregister. If a match fails, the following data is discarded. Software should only write a MA register when theassociated BAUD[MAEN] bit is clear.37.4 Functional descriptionThe LPUART supports full-duplex, asynchronous, NRZ serial communication andcomprises a baud rate generator, transmitter, and receiver block. The transmitter andreceiver operate independently, although they use the same baud rate generator. Thefollowing describes each of the blocks of the LPUART.37.4.1 Baud rate generationA 13-bit modulus counter in the baud rate generator derive the baud rate for both thereceiver and the transmitter. The value from 1 to 8191 written to SBR[12:0] determinesthe baud clock divisor for the asynchronous LPUART baud clock. The SBR bits are inthe LPUART baud rate registers, BDH and BDL. The baud rate clock drives the receiver,Chapter 37 Low Power Universal asynchronous receiver/transmitter (LPUART)KL27 Sub-Family Reference Manual , Rev. 5, 01/2016Freescale Semiconductor, Inc. 665
