27-2
MC9328MX1 Reference Manual
MOTOROLA
Universal Asynchronous Receiver/Transmitters (UART) Modules
•
Status flags for various flow control and FIFO states
•
Serial IR interface (low speed, IrDA-compatible) enable via UART Control Register 1
•
Voting logic for improved noise immunity (16x oversampling)
•
Transmitter FIFO empty interrupt suppression
•
UART internal clocks enable/disable
•
Auto baud rate detection
•
Receiver and transmitter enable/disable
•
RTS, IrDA asynchronous wake (AIRINT), and receive asynchronous wake (AWAKE) interrupts
wake the ARM920T processor from STOP mode
•
Twenty maskable interrupts
•
Two DMA Requests (TxFIFO DMA Request and RxFIFO DMA Request)
•
Escape character sequence detection
•
Software reset (SRST)
27.2.1 Module Interface
The serial and modem control signals used by the UART module are identified and described in
Table 27-1.
Table 27-1. UART Module Interface Signals
Signal
Names
I/O
Active
UART
Comments
Serial Signals
UART1_TXD
UART2_TXD
OUT
HIGH
1 and 2
Transmitter serial output (multiplexed IR or NRZ encoding
format)
UART1_RXD
UART2_RXD
IN
HIGH
1 and 2
Receiver serial input (multiplexed IR or NRZ encoding
format)
Modem Control Signals
UART1_RTS
UART2_RTS
IN
LOW
1 and 2
Controls the transmitter. By asserting RTS, the modem
signals ready to receive to the UART. Normally, the
transmitter waits until UARTx_RTS is active (low) before
transmitting a character, however when the ignore
UARTx_RTS pin (IRTS) bit is set, the transmitter sends each
character as it is ready to transmit. When this pin serves as a
general purpose input, its status is read in the RTSS bit. This
pin can post an interrupt on any transition of this pin and
wake the ARM9 core from STOP mode on its assertion.
When RTS is negated during a transmission, the UART
transmitter finishes transmitting the current character and
shuts off. The contents of the TxFIFO (characters to be
transmitted) remain undisturbed.
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Страница 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
Страница 116: ...3 30 MC9328MX1 Reference Manual MOTOROLA Memory Map ...
Страница 126: ...4 10 MC9328MX1 Reference Manual MOTOROLA ARM920T Processor ...
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Страница 272: ...13 32 MC9328MX1 Reference Manual MOTOROLA DMA Controller ...
Страница 281: ...Programming Model MOTOROLA Watchdog Timer Module 14 9 ...
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