considered to be data associated with the address and are transferred to the receive data
buffer until the next idle line condition is detected. If no address match occurs then no
transfer is made to the receive data buffer, and all following frames until the next idle
condition are also discarded. If both the LPUART_BAUD[MAEN1] and
LPUART_BAUD[MAEN2] bits are negated, the receiver operates normally and all data
received is transferred to the receive data buffer.
Idle match operation functions in the same way for both MA1 and MA2 registers.
• If only one of LPUART_BAUD[MAEN1] and LPUART_BAUD[MAEN2] is
asserted, the first character after an idle line is compared only with the associated
match register and data is transferred to the receive data buffer only on a match.
• If LPUART_BAUD[MAEN1] and LPUART_BAUD[MAEN2] are asserted, the first
character after an idle line is compared with both match registers and data is
transferred only on a match with either register.
37.4.3.2.6 Match On Match Off operation
Match on, match off operation is enabled when both LPUART_BAUD[MAEN1] and
LPUART_BAUD[MAEN2] are set and LPUART_BAUD[MATCFG] is equal to 10. In
this function, a character received by the LPUART_RX pin that matches MATCH[MA1]
is received and transferred to the receive buffer, and LPUART_STAT[RDRF] is set. All
subsequent characters are considered to be data and are also transferred to the receive
data buffer, until a character is received that matches MATCH[MA2] register. The
character that matches MATCH[MA2] and all following characters are discarded, this
continues until another character that matches MATCH[MA1] is received. If both the
LPUART_BAUD[MAEN1] and LPUART_BAUD[MAEN2] bits are negated, the
receiver operates normally and all data received is transferred to the receive data buffer.
NOTE
Match on, match off operation requires both
LPUART_BAUD[MAEN1] and LPUART_BAUD[MAEN2] to
be asserted.
37.4.4 Additional LPUART functions
The following sections describe additional LPUART functions.
Chapter 37 Low Power Universal asynchronous receiver/transmitter (LPUART)
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
Freescale Semiconductor, Inc.
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