MC9S12P128_10 Datasheet, PDF (367/566 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Serial Communication Interface (S12SCIV5)
Register
Name
Bit 7
6
5
4
3
2
0x0006
R
R8
0
0
0
0
SCIDRH _W
T8
0x0007
R
R7
R6
R5
R4
R3
R2
SCIDRL _W
T7
T6
T5
T4
T3
T2
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.
= Unimplemented or Reserved
Figure 11-2. SCI Register Summary (Sheet 2 of 2)
1
Bit 0
0
0
R1
R0
T1
T0
11.3.2.1 SCI Baud Rate Registers (SCIBDH, SCIBDL)
Module Base + 0x0000
R
W
Reset
7
IREN
0
6
TNP1
5
TNP0
4
SBR12
3
SBR11
2
SBR10
0
0
0
0
0
Figure 11-3. SCI Baud Rate Register (SCIBDH)
1
SBR9
0
0
SBR8
0
Module Base + 0x0001
R
W
Reset
7
SBR7
0
6
SBR6
5
SBR5
4
SBR4
3
SBR3
2
SBR2
0
0
0
0
1
Figure 11-4. SCI Baud Rate Register (SCIBDL)
1
SBR1
0
0
SBR0
0
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.
S12P-Family Reference Manual, Rev. 1.13
Freescale Semiconductor
367