MC9S12HZ256 Datasheet, PDF (393/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 13 Serial Communication Interface (SCIV4)
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 13-3. IRSCI Transmit Pulse Width
TNP[1:0]
11
10
01
00
Narrow Pulse Width
1/4
1/32
1/16
3/16
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.
13.3.2.2 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 13-5. SCI Control Register 1 (SCICR1)
Read: anytime
Write: anytime
MC9S12HZ256 Data Sheet, Rev. 2.04
Freescale Semiconductor
393