Техническая Спецификация для Freescale Semiconductor Tower System Eval Kit for MC9S12GN32 TWR-S12GN32-KIT TWR-S12GN32-KIT
Модели
TWR-S12GN32-KIT
Serial Communication Interface (S12SCIV5)
MC9S12G Family Reference Manual, Rev.1.23
Freescale Semiconductor
671
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.
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).
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.
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
1
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)