mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 376

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

Register Descriptions
Table 16-10 describes UTFn fields.
16.3.14 UART Receiver FIFO Registers (URFn)
The URFn registers contain control and status bits for the receiver FIFO. Note that some
bits are read only.
Table 16-11 describes URFn fields.
16-16
Address
Address
Bits
7–6
4–0
5
Reset
Reset
Field
Field
R/W
R/W
Name
FULL
TXS
TXB
7
7
Transmitter status. When written to, these bits control the meaning of UISRn[TxFIFO].
00 Inhibit transmitter FIFO status indication in UISRn.
01 Transmitter FIFO ( 25% empty
10 Transmitter FIFO ( 50% empty
11 Transmitter FIFO ( 75% empty
When read, these bits indicate the emptiness level of the FIFO.
00 Transmitter FIFO < 25% empty
01 Transmitter FIFO ( 25% empty
10 Transmitter FIFO ( 50% empty
11 Transmitter FIFO ( 75% empty
Transmitter FIFO full.
0 Transmitter FIFO is not full and can be loaded with a character.
1 Transmitter FIFO is full. Characters loaded into the transmitter FIFO when it is full are not
Transmitter buffer data level. Indicates the number of bytes, between 0 and 24, stored in the
transmitter FIFO.
transmitted.
Figure 16-16. UART Transmitter FIFO Registers (UTFn)
TXS
R/W
RXS
R/W
Figure 16-17. UART Receiver FIFO Registers (URFn)
6
6
Table 16-10. UTFn Field Descriptions
FULL
FULL
R
R
5
5
MBAR + 0x12C (URF0), 0x16C (URF1)
MBAR + 0x128 (UTF0), 0x168 (UTF1)
MCF5272 User’s Manual
4
4
1100_0000
0000_0000
Description
RXB
TXB
R
R
MOTOROLA
0
0