MC9S12E128CFUE Datasheet, PDF (251/606 Pages) Freescale Semiconductor, Inc – MC9S12E128 Data Sheet

Chapter 8 Serial Communication Interface (SCIV3)
NOTE
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
The SCI baud rate register is used to determine the baud rate of the SCI and to control the infrared
modulation/demodulation submodule.
Table 8-3. IRSCI Transmit Pulse Width
TNP[1:0]
11
10
01
00
Narrow Pulse Width
Reserved
1/32
1/16
3/16
8.3.2.2
NOTE
The baud rate generator is disabled after reset and not started until the TE
bit or the RE bit is set for the first time. The baud rate generator is disabled
when (SBR[12:0] = 0 and IREN = 0) or (SBR[12:1] = 0 and IREN = 1).
Writing to SCIBDH has no effect without writing to SCIBDL, because
writing to SCIBDH puts the data in a temporary location until SCIBDL is
written to.
SCI Control Register 1 (SCICR1)
7
6
5
4
3
2
1
0
R
LOOPS
SCISWAI
RSRC
M
WAKE
ILT
PE
PT
W
Reset
0
0
0
0
0
0
0
0
Figure 8-5. SCI Control Register 1 (SCICR1)
Read: anytime
Write: anytime
MC9S12E128 Data Sheet, Rev. 1.07
Freescale Semiconductor
251