MC68HC908LJ12 Datasheet, PDF (235/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Infrared Serial Communications
13.7.2 Transmitter
Figure 13-7 shows the structure of the SCI transmitter.
The baud rate clock source for the SCI can be selected by the CKS bit,
in the SCI baud rate register (see 13.11.7 SCI Baud Rate Register
(SCBR)).
CKS
CGMXCLK
BUS CLOCK
A
B
SL
X
PRE- BAUD
SCALER DIVIDER
÷ 16
SL = 0 => X = A
SL = 1 => X = B
SCP1
SCP0
SCR1
SCR2
SCR0
INTERNAL BUS
SCI DATA REGISTER
11-BIT
TRANSMIT
SHIFT REGISTER
H8 7 6 5 4 3 2 1 0 L
SCI_TxD
M
PEN
PARITY
PTY
GENERATION
T8
DMATE
DMATE
SCTIE
SCTE
DMATE
SCTE
SCTIE
TC
TCIE
SCTE
SCTIE
TC
TCIE
TRANSMITTER
CONTROL LOGIC
SBK
LOOPS
ENSCI
TE
Figure 13-7. SCI Transmitter
Technical Data
236
MC68HC908LJ12 — Rev. 2.1
Infrared Serial Communications Interface Module (IRSCI) Freescale Semiconductor