Serial Communication Interface (S12SCIV5)
MC9S12G Family Reference Manual Rev.1.27
NXP Semiconductors 657
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
RR8
T8
000000
W
0x0007
SCIDRL
RR7R6R5R4R3R2R1R0
WT7T6T5T4T3T2T1T0
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
76543210
R
IREN TNP1 TNP0 SBR12 SBR11 SBR10 SBR9 SBR8
W
Reset00000000
Figure 20-3. SCI Baud Rate Register (SCIBDH)
Module Base + 0x0001
76543210
R
SBR7 SBR6 SBR5 SBR4 SBR3 SBR2 SBR1 SBR0
W
Reset00000100
Figure 20-4. SCI Baud Rate Register (SCIBDL)
Register
Name
Bit 76 5 4 3 2 1Bit 0
= Unimplemented or Reserved
Figure 20-2. SCI Register Summary (Sheet 2 of 2)
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