MC68HC908LJ24 Datasheet, PDF (254/464 Pages) Motorola, Inc – Microcontrollers

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).
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
Data Sheet
254
MC68HC908LJ24/LK24 — Rev. 2.1
Infrared Serial Communications Interface Module (IRSCI) Freescale Semiconductor