MC68HC912D60A MOTOROLA [Motorola, Inc], MC68HC912D60A Datasheet - Page 267

• Manufacturer Part Number: MC68HC912D60A
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

15.4.3 SCI Register Descriptions
SC0BDH/SC1BDH — SCI Baud Rate Control Register
SC0BDL/SC1BDL — SCI Baud Rate Control Register
MC68HC912D60A — Rev 3.0
MOTOROLA
RESET:
RESET:
BTST
Bit 7
SBR7
Bit 7
NOTE:
0
0
BSPL
SBR6
6
0
6
0
Control and data registers for the SCI subsystem are described below.
The memory address indicated for each register is the default address
that is in use after reset. Both SCI have identical control registers
mapped in two blocks of eight bytes.
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.
Freescale Semiconductor, Inc.
For More Information On This Product,
BRLD
SBR5
5
0
5
0
Go to: www.freescale.com
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
1
0
1
0
Multiple Serial Interface
SBR8
SBR0
Bit 0
Bit 0
0
0
Technical Data
$00C0/$00C8
$00C1/$00C9
High
Low
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