參數(shù)資料
型號(hào): MC68EZ328PU16V
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: MICROPROCESSOR, PQFP100
封裝: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, TQFP-100
文件頁(yè)數(shù): 30/246頁(yè)
文件大小: 2507K
代理商: MC68EZ328PU16V
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Universal Asynchronous Receiver/Transmitter
MOTOROLA
MC68EZ328 USERS MANUAL
11-3
a direct connection can be made to external IrDA transceiver modules that uses active low
pulses. Figure 11-3 illustrates a character in IrDA mode.
11.1.3 SERIAL INTERFACE SIGNALS
The UART module has five signals that can be used to communicate with external
UART-compatible devices.
TXDThe RS-232 Transmit Data signal, which is multiplexed with PE5, is the RS-232
transmitter serial output. While the UART is in NRZ mode, normal data is output with
marks transmitted as logic high and spaces transmitted as logic low. In IrDA mode,
this pin, which is a 1.6
msec pulse, is output for each zero bit that is transmitted. The
current value of this pin can be read in the TXPOL bit of the UART miscellaneous
(UMISC) register. This pin connects to standard RS-232 or infra-red transceiver
modules.
CTS The Clear To Send signal, which is multiplexed with PE7, is an active-low input
used for transmitter flow control. The transmitter waits until this signal is asserted (low)
before it starts transmitting a character. If this signal is negated while a character is
being transmitted, the character will be completed, but no other character will be
transmitted until this signal is asserted again. The current value of this pin can be read
in the CTSSTAT bit of the UART transmitter (UTX) register.
If the NOCTS bit of the UTX register is set, the transmitter sends a character whenever
a character is ready to be transmitted. You can program this pin to post an interrupt on
rising and falling edges if the CTSD bit is set in the UART control (USTCNT) register.
Standard RS-232 transceivers translate from RS-232 logic levels to levels that are
compatible with the MC68EZ328.
RXDThe Receive Data signal, which is multiplexed with PE4, is the receiver serial
input. Like the TXD pin, while in NRZ mode, standard NRZ data is expected. In IrDA
mode, a pulse of at least 1.0
msec is expected for each zero bit received. The required
pulse polarity is controlled by the RXPOL bit of the UART miscellaneous (UMISC)
register. This pin interfaces to standard RS-232 and infra-red transceiver modules.
RTSThe Request To Send signal, which is multiplexed with PE6, serves two
purposes. Normally, this signal is used for flow control, in which the receiver indicates
that it is ready to receive data by asserting this pin (low). This pin is then connected to
the far-end transmitters CTS pin. When the receiver FIFO is nearly full (four slots are
remaining), which indicates a pending FIFO overrun, this pin is negated (high). When
Figure 11-3. IrDA ASCII A Character with Odd Parity
START
BIT
0
BIT
1
BIT
2
BIT
3
BIT
4
BIT
5
BIT
6
BIT
7
PARITY
BIT
STOP
BIT
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