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transmitter is finished transmitting all data, preamble, and break characters and is idle
with UART_TX at the inactive level. This flag is often used in systems with modems to
determine when it is safe to turn off the modem. If the transmit complete interrupt enable
(UART_C2[TCIE]) bit is set, a hardware interrupt is requested when UART_S1[TC] is
set. Instead of hardware interrupts, software polling may be used to monitor the
UART_S1[TDRE] and UART_S1[TC] status flags if the corresponding UART_C2[TIE]
or UART_C2[TCIE] local interrupt masks are cleared.
When a program detects that the receive data register is full (UART_S1[RDRF] = 1), it
gets the data from the receive data register by reading UART_D. The UART_S1[RDRF]
flag is cleared by reading UART_D.
The IDLE status flag includes logic that prevents it from getting set repeatedly when the
UART_RX line remains idle for an extended period of time. IDLE is cleared by writing 1
to the UART_S1[IDLE] flag. After UART_S1[IDLE] has been cleared, it cannot become
set again until the receiver has received at least one new character and has set
UART_S1[RDRF].
If the associated error was detected in the received character that caused
UART_S1[RDRF] to be set, the error flags - noise flag (UART_S1[NF]), framing error
(UART_S1[FE]), and parity error flag (UART_S1[PF]) - are set at the same time as
UART_S1[RDRF]. These flags are not set in overrun cases.
If UART_S1[RDRF] was already set when a new character is ready to be transferred
from the receive shifter to the receive data buffer, the overrun (UART_S1[OR]) flag is
set instead of the data along with any associated NF, FE, or PF condition is lost.
At any time, an active edge on the UART_RX serial data input pin causes the
UART_S2[RXEDGIF] flag to set. The UART_S2[RXEDGIF] flag is cleared by writing a
1 to it. This function depends on the receiver being enabled (UART_C2[RE] = 1).
Functional description
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
644
Freescale Semiconductor, Inc.
Содержание MKW01Z128
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