mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 435

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

23.3.11 UART Baud Rate Generator Registers (UBG1n/UBG2n)
The UBG1n registers hold the MSB, and the UBG2n registers hold the LSB of the preload value. UBG1n
and UBG2n concatenate to provide a divider to the internal bus clock for transmitter/receiver operation,
as described in
23.3.12 UART Input Port Register (UIPn)
The UIPn registers show the current state of the UCTSn input.
Freescale Semiconductor
IPSBAR
IPSBAR
IPSBAR
Offset:
Offset:
Offset:
Reset:
Reset:
Reset:
W
W
W
R
R
R
0x00_0218 (UBG10)
0x00_0258 (UBG11)
0x00_0298 (UBG12)
0x00_021C (UBG20)
0x00_025C (UBG21)
0x00_029C (UBG22)
0x00_0234 (UIP0)
0x00_0274 (UIP1)
0x00_02B4 (UIP2)
The minimum value loaded on the concatenation of UBG1n with UBG2n is
0x0002. The UBG2n reset value of 0x00 is invalid and must be written to
before the UART transmitter or receiver are enabled. UBG1n and UBG2n
are write-only and cannot be read by the CPU.
Section 23.4.1.2.1, “Internal Bus Clock Baud
0
0
1
1
7
7
7
Figure 23-13. UART Baud Rate Generator Registers (UBG1n)
Figure 23-14. UART Baud Rate Generator Registers (UBG2n)
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
6
0
6
0
6
1
1
Figure 23-15. UART Input Port Registers (UIPn)
0
0
1
1
5
5
5
NOTE
0
0
1
1
4
4
4
Divider MSB
Divider LSB
Rates.”
0
0
1
1
3
3
3
0
0
1
1
2
2
2
Access: User write-only
Access: User write-only
Access: User read-only
0
0
1
1
1
1
1
UART Modules
CTS
0
0
1
0
0
0
23-15