Datasheet

14-6 MCF5407 User’s Manual
Register Descriptions
Table 14-2 describes UMR1n fields.
7 6 543210
Field RxRTS RxIRQ/FFULL ERR PM PT B/C
Reset 0000_0000
R/W R/W
Address MBAR + 0x1C0 (UART0), 0x200 (UART1). After UMR1n is read or written, the pointer points to UMR2n.
Figure 14-2. UART Mode Registers 1 (UMR1n)
Table 14-2. UMR1n Field Descriptions
Bits Name Description
7 RxRTS Receiver request-to-send. Allows the R
TS output to control the CTS input of the transmitting device
to prevent receiver overrun. If both the receiver and transmitter are incorrectly programmed for R
TS
control, R
TS control is disabled for both. Transmitter RTS control is configured in UMR2n[TxRTS].
Not used in modem mode.
0 The receiver has no effect on R
TS.
1 When a valid start bit is received, R
TS is negated if the UART's FIFO is full. RTS is reasserted
when the FIFO has an empty position available.
6 RxIRQ/
FFULL
Receiver interrupt select. This bit is used in UART and modem modes.
0 RxRDY is the source that generates IRQ.
1 FFULL is the source that generates IRQ.
5 ERR Error mode. Configures the FIFO status bits, USRn[RB,FE,PE]. This bit is not used in modem mode.
0 Character mode. The USRn values reflect the status of the character at the top of the FIFO. ERR
must be 0 for correct A/D flag information when in multidrop mode.
1 Block mode. The USRn values are the logical OR of the status for all characters reaching the top of
the FIFO because the last
RESET ERROR STATUS command for the channel was issued. See
Section 14.3.10, “UART Command Registers (UCRn).”
4–3 PM Parity mode. Selects the parity or multidrop mode for the channel. The parity bit is added to the
transmitted character, and the receiver performs a parity check on incoming data. The value of PM
affects PT, as shown below. PM is not used in modem mode.
2 PT Parity type. PM and PT together select parity type (PM = 0x) or determine whether a data or address
character is transmitted (PM = 11). PT is not used in modem mode.
PM Parity Mode Parity Type (PT= 0) Parity Type (PT= 1)
00 With parity Even parity Odd parity
01 Force parity Low parity High parity
10 No parity n/a
11 Multidrop mode Data character Address character
1–0 B/C Bits per character. Select the number of data bits per character to be sent. The values shown do not
include start, parity, or stop bits. B/C is not used in modem mode.
00 5 bits
01 6 bits
10 7 bits
11 8 bits