SC9S12XS256J1MAA FREESCALE [Freescale Semiconductor, Inc], SC9S12XS256J1MAA Datasheet - Page 400

• Manufacturer Part Number: SC9S12XS256J1MAA
• Description: HCS12 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Serial Communication Interface (S12SCIV5)
14.3.2.1
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.
The SCI baud rate register is used by to determine the baud rate of the SCI, and to control the infrared
modulation/demodulation submodule.
400
Module Base + 0x0000
Module Base + 0x0001
SBR[12:0]
TNP[1:0]
Reset
Reset
Field
IREN
6:5
4:0
7:0
7
W
W
R
R
SBR7
IREN
Infrared Enable Bit — This bit enables/disables the infrared modulation/demodulation submodule.
0 IR disabled
1 IR enabled
Transmitter Narrow Pulse Bits — These bits enable whether the SCI transmits a 1/16, 3/16, 1/32 or 1/4 narrow
pulse. See
SCI Baud Rate Bits — The baud rate for the SCI is determined by the bits in this register. The baud rate is
calculated two different ways depending on the state of the IREN bit.
The formulas for calculating the baud rate are:
Note: The baud rate generator is disabled after reset and not started until the TE bit or the RE bit is set for the
Note: Writing to SCIBDH has no effect without writing to SCIBDL, because writing to SCIBDH puts the data in
SCI Baud Rate Registers (SCIBDH, SCIBDL)
0
0
7
7
When IREN = 0 then,
When IREN = 1 then,
Those two registers are only visible in the memory map if AMAP = 0 (reset
condition).
SCI baud rate = SCI bus clock / (16 x SBR[12:0])
SCI baud rate = SCI bus clock / (32 x SBR[12:1])
first time. The baud rate generator is disabled when (SBR[12:0] = 0 and IREN = 0) or (SBR[12:1] = 0 and
IREN = 1).
a temporary location until SCIBDL is written to.
Table
TNP1
SBR6
0
0
6
6
14-3.
Table 14-2. SCIBDH and SCIBDL Field Descriptions
Figure 14-3. SCI Baud Rate Register (SCIBDH)
Figure 14-4. SCI Baud Rate Register (SCIBDL)
S12XS Family Reference Manual, Rev. 1.09
TNP0
SBR5
0
0
5
5
SBR12
SBR4
NOTE
0
0
4
4
Description
SBR11
SBR3
0
0
3
3
SBR10
SBR2
0
1
2
2
Freescale Semiconductor
SBR9
SBR1
0
0
1
1
SBR8
SBR0
0
0
0
0