Datasheet

Serial Communications Interface (SCI)
MC9S12DP256 — Revision 1.1
Serial Communications Interface (SCI)
Register Descriptions
This section consists of register descriptions in address order. Each
description includes a standard register diagram with an associated
figure number. Writes to a reserved register location do not have any
effect and reads of these locations return a zero. Details of register bit
and field function follow the register diagrams, in bit order.
SCI Baud Rate
Registers
(SCIBDH/L)
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:
SCI baud rate = SCI module clock / (16 x BR),
where 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.
Read: anytime. A read will not return the correct data if only SCIBDH is
written to. SCIBDL must also be written to, following a write to SCIBDH.
Address Offset: $000
7 6 5 4 3 2 1 0
R 0 0 0
SBR12 SBR11 SBR10 SBR9 SBR8
W
RESET: 0 0 0 0 0 0 0 0
= Unimplemented or Reserved
Address Offset: $001
7 6 5 4 3 2 1 0
R
SBR7 SBR6 SBR5 SBR4 SBR3 SBR2 SBR1 SBR0
W
RESET: 0 0 0 0 0 1 0 0
= Unimplemented or Reserved
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