mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 370

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Register Descriptions
16-10
Bits
6–4
3–2
7
Value
ENAB
000
001
010
011
100
101
110
111
00
01
10
11
NO COMMAND
RESET MODE
REGISTER POINTER
RESET RECEIVER
RESET
TRANSMITTER
RESET ERROR
STATUS
RESET BREAK
CHANGE INTERRUPT
START BREAK
STOP BREAK
NO ACTION TAKEN
TRANSMITTER
ENABLE
TRANSMITTER
DISABLE
Command
—
—
–
Table 16-6. UCRn Field Descriptions
Enable autobaud
0 Autobaud disabled.
1 Autobaud enabled. The transmission rate is calculated from the first received
—
Causes the mode register pointer to point to UMR1n.
Immediately disables the receiver, clears USRn[FFULL,RxRDY], and reinitializes
the receiver FIFO pointer. No other registers are altered. Because it places the
receiver in a known state, use this command instead of
reconfiguring the receiver.
Disables the transmitter and clears USRn[TxEMP,TxRDY]. No other registers are
altered. Because it places the transmitter in a known state, use this command
instead of
Clears USRn[RB,FE,PE,OE]. Also used in block mode to clear all error bits after
a data block is received.
Clears the delta break bit, UISRn[DB].
Forces TxD low. If the transmitter is empty, the break may be delayed up to one
bit time. If the transmitter is active, the break starts when character transmission
completes. The break is delayed until any character in the transmitter shift
register is sent. Any character in the transmitter holding register is sent after the
break. The transmitter must be enabled for the command to be accepted. This
command ignores the state of CTS.
Causes TxD to go high (mark) within two bit times. Any characters in the
transmitter buffer are sent.
Causes the transmitter to stay in its current mode: if the transmitter is enabled, it
remains enabled; if the transmitter is disabled, it remains disabled.
Enables operation of the channel’s transmitter. USRn[TxEMP,TxRDY] are set. If
the transmitter is already enabled, this command has no effect.
Terminates transmitter operation and clears USRn[TxEMP,TxRDY]. If a character
is being sent when the transmitter is disabled, transmission completes before the
transmitter becomes inactive. If the transmitter is already disabled, the command
has no effect.
Reserved, do not use.
MISC Field (This field selects a single command.)
character. If the rate must be recalculated, ENAB must first be cleared and
reset. UISRn[ABC] indicates a transmission rate has been calculated and
loaded into the UART divider registers. UDUn and UDULn must be initialized
to 0x00 before enabling autobaud.
TC Field (This field selects a single command)
MCF5272 User’s Manual
TRANSMITTER DISABLE
when reconfiguring the transmitter.
Description
RECEIVER DISABLE
MOTOROLA
when