mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 429

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

23.3.4
The UCSRs select an external clock on the DTIN input (divided by 1 or 16) or a prescaled internal bus
clock as the clocking source for the transmitter and receiver. See
Clock
for both, set UCSRn to 0xDD.
23.3.5
The UCRs supply commands to the UART. Only multiple commands that do not conflict can be specified
in a single write to a UCRn. For example,
specified in one command.
Freescale Semiconductor
RXRDY
FFULL
Field
Field
RCS
TCS
7–4
3–0
1
0
IPSBAR
Offset:
Reset:
Source.” The transmitter and receiver can use different clock sources. To use the internal bus clock
FIFO full.
0 The FIFO is not full but may hold up to two unread characters.
1 A character was received and the receiver FIFO is now full. Any characters received when the FIFO is full are lost.
Receiver ready.
0 The CPU has read the receive buffer and no characters remain in the FIFO after this read.
1 One or more characters were received and are waiting in the receive buffer FIFO.
Receiver clock select. Selects the clock source for the receiver.
1101 Prescaled internal bus clock (f
1110 DTINn divided by 16
1111 DTINn
Transmitter clock select. Selects the clock source for the transmitter.
1101 Prescaled internal bus clock (f
1110 DTINn divided by 16
1111 DTINn
W
R
UART Clock Select Registers (UCSRn)
UART Command Registers (UCRn)
0x00_0204 (UCSR0)
0x00_0244 (UCSR1)
0x00_0284 (UCSR2)
Note: The RCS and TCS reset values are set so the receiver and transmiter use the prescaled internal bus
7
clock as their clock source.
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
Figure 23-6. UART Clock Select Registers (UCSRn)
6
Table 23-5. USRn Field Descriptions (continued)
See Note
RCS
Table 23-6. UCSRn Field Descriptions
sys
sys
5
)
)
RESET TRANSMITTER
4
Description
Description
3
and
Section 23.4.1, “Transmitter/Receiver
ENABLE TRANSMITTER
2
See Note
TCS
Access: User write-only
1
cannot be
UART Modules
0
23-9