MCF5307AI66B Datasheet, PDF (315/484 Pages) Motorola, Inc – Integrated Microprocessor User’s Manual

Freescale Semiconductor, Inc.
Register Descriptions
7
6
5
4
3
2
1
0
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 describes UMR1n fields.
Table 14-2. UMR1n Field Descriptions
Bits Name
Description
7 RxRTS Receiver request-to-send. Allows the RTS output to control the CTS input of the transmitting device
to prevent receiver overrun. If both the receiver and transmitter are incorrectly programmed for RTS
control, RTS control is disabled for both. Transmitter RTS control is configured in UMR2n[TxRTS].
0 The receiver has no effect on RTS.
1 When a valid start bit is received, RTS is negated if the UART's FIFO is full. RTS is reasserted
when the FIFO has an empty position available.
6 RxIRQ/ Receiver interrupt select.
FFULL 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].
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 14.3.5, “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.
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).
PM
Parity Mode
Parity Type (PT= 0)
Parity Type (PT= 1)
00 With parity
01 Force parity
10 No parity
11 Multidrop mode
Even parity
Low parity
Data character
Odd parity
High parity
n/a
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.
00 5 bits
01 6 bits
10 7 bits
11 8 bits
Chapter 14. UART Modules
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