mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 354
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mcf5407
Manufacturer Part Number
mcf5407
Description
Mcf5407 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5407.pdf
(546 pages)
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Register Descriptions
14.3.7 UART Clock-Select Registers (UCSRn)
The UART clock-select registers (UCSRn) select an external clock on the TIN input
(divided by 1 or 16) or a prescaled CLKIN as the clocking source for the transmitter and
receiver. See Section 14.5.1, “Transmitter/Receiver Clock Source.” UCSR1 is used in
UART mode only. The transmitter and receiver can use different clock sources. To use
CLKIN for both, set UCSRn to 0xDD.
Table 14-8 describes UCSRn fields.
14.3.8 Receive Samples Available Register (RSMP)
The receive samples available register (RSMP), Figure 14-9, shows the current byte count
for the Rx FIFO. It is in UART1 only and can be used in both UART and modem modes.
14-12
Address
Bits
Bits
1
0
7–4
3–0
Reset
Field
R/W
RxRDY Receiver ready (in UART or modem modes).
FFULL
Name
Name
RCS
TCS
7
FIFO full.
UART0:
0 The FIFO is not full but may hold up to two unread characters.
1 A character was received and is waiting in the receiver buffer FIFO.
UART1 (in UART or modem modes):
1 Rx FIFO is full, as defined by the RXLVL. FFULL is set as soon as the number of bytes in the Rx
0 The CPU has read the receiver buffer and no characters remain in the FIFO after this read.
1 One or more characters were received and are waiting in the receiver buffer FIFO.
FIFO exceeds the RXLVL value, due to the transfer of a sample (1 or 2 bytes) from the Rx shift
register to the Rx FIFO.
Receiver clock select. Selects the clock source for the receiver channel.
1101 Prescaled CLKIN
1110 TIN divided by 16
1111 TIN
Transmitter clock select. Selects the clock source for the transmitter channel.
1101 Prescaled CLKIN
1110 TIN divided by 16
1111 TIN
Figure 14-8. UART Clock-Select Register (UCSRn)
Table 14-7. USRn Field Descriptions (Continued)
Table 14-8. UCSRn Field Descriptions
RCS
MBAR + 0x1C4 (UCSR0), 0x204 (UCSR1)
MCF5407 User’s Manual
4
0000_0000
Write only
Description
Description
3
TCS
0
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