MC68HC912BD32 Datasheet, PDF (151/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Serial Interface
Serial Communication Interface (SCI)
SC0BDH — SCI Baud Rate Control Register
Bit 7
6
5
4
BTST BSPL BRLD SBR12
RESET:
0
0
0
0
3
SBR11
0
2
SBR10
0
1
SBR9
0
Bit 0
SBR8
0
$00C0
High
SC0BDL — SCI Baud Rate Control Register
Bit 7
6
5
4
SBR7 SBR6 SBR5 SBR4
RESET:
0
0
0
0
3
SBR3
0
2
SBR2
1
1
SBR1
0
Bit 0
SBR0
0
$00C1
Low
SC0BDH and SC0BDL 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:
SCI Baud Rate = _{1--M--6---C-×}----L-B---K-R---
which is equivalent to:
BR = _{1----6----×}-----S---MC----I-C---B--L--a--Ku---d-----R----a---t-e-
BR is the value written to bits SBR[12:0] to establish baud rate.
NOTE:
The baud rate generator is disabled until the TE or RE bit in SC0CR2
register is set for the first time after reset, and/or the baud rate generator
is disabled when SBR[12:0] = 0.
BTST — Baud Register Test
Reserved for test function
BSPL — Baud Rate Counter Split
Reserved for test function
BRLD — Baud Rate Reload
Reserved for test function
5-sint
MC68HC912BD32 Rev 1.0
Serial Interface
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