MC912DG128A Motorola, MC912DG128A Datasheet - Page 227

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

SC0BDH/SC1BDH — SCI Baud Rate Control Register
SC0BDL/SC1BDL — SCI Baud Rate Control Register
5-msi
MOTOROLA
RESET:
RESET:
SBR7
BTST
Bit 7
Bit 7
NOTE:
0
0
SBR6
BSPL
6
0
6
0
SCxBDH and SCxBDL are considered together as a 16-bit baud rate
control register.
Read any time. Write SBR[12:0] anytime. Low order byte must be written
for change to take effect. Write SBR[15:13] only in special modes. The
value in SBR[12:0] determines the baud rate of the SCI. The desired
baud rate is determined by the following formula:
which is equivalent to:
BR is the value written to bits SBR[12:0] to establish baud rate.
The baud rate generator is disabled until TE or RE bit in SCxCR2
register is set for the first time after reset, and/or the baud rate generator
is disabled when SBR[12:0] = 0.
BTST — Reserved for test function
BSPL — Reserved for test function
BRLD — Reserved for test function
BRLD
SBR5
5
0
5
0
Multiple Serial Interface
SBR12
SBR4
4
0
4
0
SBR11
SCI Baud Rate
BR
SBR3
3
0
3
0
=
----------------------------------------------- -
16 SCI Baud Rate
SBR10
MCLK
SBR2
=
2
0
2
1
------------------- -
16 BR
MCLK
Serial Communication Interface (SCI)
SBR9
SBR1
MC68HC912DT128A Rev 2.0
1
0
1
0
Multiple Serial Interface
SBR8
SBR0
Bit 0
Bit 0
0
0
$00C0/$00C8
$00C1/$00C9
High
Low
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