mc9s12c32mpb16 Freescale Semiconductor, Inc, mc9s12c32mpb16 Datasheet - Page 387

• Manufacturer Part Number: mc9s12c32mpb16
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

13.3.2.1
The SCI Baud Rate Register is used by the counter to determine the baud rate of the SCI. The formula for
calculating the baud rate is:
where:
Read: Anytime. 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
Freescale Semiconductor
Module Base + 0x_0001
Module Base + 0x_0000
SBR[12:0]
Reset
Reset
Field
4–0
7–0
W
W
R
R
SCI baud rate = SCI module clock / (16 x BR)
BR is the content of the SCI baud rate registers, bits SBR12 through SBR0. The baud rate registers
can contain a value from 1 to 8191.
SBR7
SCI Baud Rate Bits — The baud rate for the SCI is determined by these 13 bits.
Note: The baud rate generator is disabled until the TE bit or the RE bit is set for the first time after reset. The
SCI Baud Rate Registers (SCIBDH and SCHBDL)
0
0
0
7
7
baud rate generator is disabled when BR = 0.
Writing to SCIBDH has no effect without writing to SCIBDL, since writing to SCIBDH puts the data in a
temporary location until SCIBDL is written to.
= Unimplemented or Reserved
Figure 13-3. SCI Baud Rate Registers (SCIBDH and SCIBDL)
SBR6
0
0
0
6
6
Table 13-1. SCIBDH AND SCIBDL Field Descriptions
SBR5
MC9S12C-Family / MC9S12GC-Family
0
0
0
5
5
Chapter 13 Serial Communications Interface (S12SCIV2) Block Description
SBR12
SBR4
Rev 01.23
0
0
4
4
Description
SBR11
SBR3
0
0
3
3
SBR10
SBR2
0
1
2
2
SBR9
SBR1
0
0
1
1
SBR8
SBR0
0
0
0
0
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