MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Serial Communications Interface Modules (SCI1 and SCI2)
16.7.1 SCI Baud Rate Registers
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Freescale Semiconductor, I
Address: SCI1 — 0x00cc_0000
SCI2 — 0x00cd_0000
Read: Anytime
Write: Anytime
Bit 7 6 5 4 3 2 1 Bit 0
Read: 0 0 0
Write:
SBR[12:8], SBR[7:0] — SCI Baud Rate Bits
These read/write bits control the SCI baud rate:
where:
1 ≤ SBR[12:0] ≤ 8191
SBR12 SBR11 SBR10 SBR9 SBR8
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
Read:
Write:
Bit 7 6 5 4 3 2 1 Bit 0
SBR7 SBR6 SBR5 SBR4 SBR3 SBR2 SBR1 SBR0
Reset: 0 0 0 0 0 1 0 0
Figure 16-3. SCI Baud Rate Register Low (SCIBDL)
f sys
SCI baud rate =
16 x SBR[12:0]
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 MMC2107 – Rev. 2.0
336 Serial Communications Interface Modules (SCI1 and SCI2) MOTOROLA
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