mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 356

• Manufacturer Part Number: mcf5407
• Description: Mcf5407 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Register Descriptions
Table 14-11 describes UCRn fields and commands. Examples in Section 14.5.2,
“Transmitter and Receiver Operating Modes,” show how these commands are used.
7
6–4
14-14
Bits
Value
000
001
010
011
100
101
110
111
—
Address
Reset
Field
R/W
NO COMMAND
RESET MODE
REGISTER POINTER
RESET RECEIVER
RESET
TRANSMITTER
RESET ERROR
STATUS
RESET BREAK
CHANGE INTERRUPT
START BREAK
STOP BREAK
Command
—
—
Figure 14-11. UART Command Register (UCRn)
7
–
Table 14-11. UCRn Field Descriptions
6
Reserved, should be cleared.
—
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.
In UART mode, immediately 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
when reconfiguring the transmitter. When UART1 is in modem mode, TxEMP is
not cleared by this soft reset. It is cleared the same way as the Rx overflow bit,
by a
In UART mode, clears USRn[RB,FE,PE,OE]. Also used in block mode to clear all
error bits after a data block is received. When UART1 is in modem mode, this
command also clears TxEMP.
Clears the delta break bit, UISRn[DB]. This command has no effect in modem
mode.
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 and has no effect in modem mode.
Causes TxD to go high (mark) within two bit times. Any characters in the
transmitter buffer are sent.
MISC Field (This field selects a single command.)
RESET ERROR STATUS
MISC
MCF5407 User’s Manual
MBAR + 0x1C8, 0x208
4
0000_0000
Write only
command.
3
Description
TC
2
1
RECEIVER DISABLE
RC
TRANSMITTER DISABLE
0
when