37.3.5 LPUART Match Address Register (LPUARTx_MATCH)
Address: Base a 10h offset
Bit 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
0
R
W
Reset
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 0
LPUARTx_MATCH field descriptions
Field
Description
31–26
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
25–16
MA2
Match Address 2
The MA1 and MA2 registers are compared to input data addresses when the most significant bit is set and
the associated BAUD[MAEN] bit is set. If a match occurs, the following data is transferred to the data
register. If a match fails, the following data is discarded. Software should only write a MA register when the
associated BAUD[MAEN] bit is clear.
15–10
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
MA1
Match Address 1
The MA1 and MA2 registers are compared to input data addresses when the most significant bit is set and
the associated BAUD[MAEN] bit is set. If a match occurs, the following data is transferred to the data
register. If a match fails, the following data is discarded. Software should only write a MA register when the
associated BAUD[MAEN] bit is clear.
37.4 Functional description
The LPUART supports full-duplex, asynchronous, NRZ serial communication and
comprises a baud rate generator, transmitter, and receiver block. The transmitter and
receiver operate independently, although they use the same baud rate generator. The
following describes each of the blocks of the LPUART.
37.4.1 Baud rate generation
A 13-bit modulus counter in the baud rate generator derive the baud rate for both the
receiver and the transmitter. The value from 1 to 8191 written to SBR[12:0] determines
the baud clock divisor for the asynchronous LPUART baud clock. The SBR bits are in
the 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, 01/2016
Freescale Semiconductor, Inc.
665
Содержание MKL27Z128VFM4
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