MMC2107 Datasheet, PDF (336/618 Pages) –

Freescale Semiconductor, Inc.
Serial Communications Interface Modules (SCI1 and SCI2)
16.7.1 SCI Baud Rate Registers
Address: SCI1 — 0x00cc_0000
SCI2 — 0x00cd_0000
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
SBR12 SBR11 SBR10 SBR9 SBR8
Write:
Reset: 0
0
0
0
0
0
0
0
= Writes have no effect and the access terminates without a transfer error exception.
Figure 16-2. SCI Baud Rate Register High (SCIBDH)
Address: SCI1 — 0x00cc_0001
SCI2 — 0x00cd_0001
Bit 7
6
5
4
3
2
1
Read:
SBR7
Write:
SBR6
SBR5
SBR4
SBR3
SBR2
SBR1
Reset: 0
0
0
0
0
1
0
Figure 16-3. SCI Baud Rate Register Low (SCIBDL)
Bit 0
SBR0
0
Read: Anytime
Write: Anytime
SBR[12:8], SBR[7:0] — SCI Baud Rate Bits
These read/write bits control the SCI baud rate:
f_sys
SCI baud rate =
16 x SBR[12:0]
where:
1 ≤ SBR[12:0] ≤ 8191
NOTE:
The baud rate generator is disabled until the TE bit or the RE bit in
SCICR2 is set for the first time after reset. The baud rate generator is
disabled when SBR[12:0] = 0.
Writing to SCIBDH has no effect without also writing to SCIBDL. Writing
to SCIBDH puts the data in a temporary location until data is written to
SCIBDL.
Technical Data
336
Serial Communications Interface Modules (SCI1 and SCI2)
For More Information On This Product,
Go to: www.freescale.com
MMC2107 – Rev. 2.0
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