Chapter 20 Serial Communication Interface (S12SCIV5)
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
727
20.3.2.1
SCI Baud Rate Registers (SCIBDH, SCIBDL)
Read: Anytime, if AMAP = 0. If only SCIBDH is written to, a read will not return the correct data until
SCIBDL is written to as well, following a write to SCIBDH.
Write: Anytime, if AMAP = 0.
NOTE
Those two registers are only visible in the memory map if AMAP = 0 (reset
condition).
The SCI baud rate register is used by to determine the baud rate of the SCI, and to control the infrared
modulation/demodulation submodule.
0x0006
SCIDRH
R
R8
T8
0
0
0
0
0
0
W
0x0007
SCIDRL
R
R7
R6
R5
R4
R3
R2
R1
R0
W
T7
T6
T5
T4
T3
T2
T1
T0
1.These registers are accessible if the AMAP bit in the SCISR2 register is set to zero.
2,These registers are accessible if the AMAP bit in the SCISR2 register is set to one.
Module Base + 0x0000
7
6
5
4
3
2
1
0
R
IREN
TNP1
TNP0
SBR12
SBR11
SBR10
SBR9
SBR8
W
Reset
0
0
0
0
0
0
0
0
Figure 20-3. SCI Baud Rate Register (SCIBDH)
Module Base + 0x0001
7
6
5
4
3
2
1
0
R
SBR7
SBR6
SBR5
SBR4
SBR3
SBR2
SBR1
SBR0
W
Reset
0
0
0
0
0
0
0
0
Figure 20-4. SCI Baud Rate Register (SCIBDL)
Register
Name
Bit 7
6
5
4
3
2
1
Bit 0
= Unimplemented or Reserved
Figure 20-2. SCI Register Summary (Sheet 2 of 2)
1
Those registers are accessible if the AMAP bit in the SCISR2 register is set to zero
2
Those registers are accessible if the AMAP bit in the SCISR2 register is set to one
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
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part
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currently
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available
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for
import
or
sale
in
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States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
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