MC68HC908GR8 Datasheet, PDF (165/286 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Functional Description
18.4.2 Transmitter
Figure 18-4 shows the structure of the SCI transmitter.
The baud rate clock source for the SCI can be selected via the configuration bit, SCIBDSRC.
SCIBDSRC
FROM
CONFIG2
CGMXCLK
IT12
A
B
SL
X
SL = 0 => X = A
SL = 1 => X = B
INTERNAL BUS
÷4
PRE- BAUD
SCALER DIVIDER
÷ 16
SCP1
SCP0
SCR1
SCR2
SCR0
TXINV
SCI DATA REGISTER
11-BIT
TRANSMIT
SHIFT REGISTER
H876543210L
M
PEN
PARITY
PTY
GENERATION
T8
DMATE
DMATE
SCTIE
SCTE
DMATE
SCTE
SCTIE
TC
TCIE
TRANSMITTER
CONTROL LOGIC
SCTE
SCTIE
TC
TCIE
SBK
LOOPS
ENSCI
TE
Figure 18-4. SCI Transmitter
PE2/TxD
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
Freescale Semiconductor
165