Datasheet

Infrared Serial Communications
Data Sheet MC68HC908LJ24/LK24 — Rev. 2.1
254 Infrared Serial Communications Interface Module (IRSCI) Freescale Semiconductor
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).
Figure 13-7. SCI Transmitter
DMATE
SCTE
PEN
PTY
H876543210L
11-BIT
TRANSMIT
STOP START
T8
DMATE
SCTE
SCTIE
TCIE
SBK
TC
PARITY
GENERATION
MSB
SCI DATA REGISTER
LOAD FROM SCDR SHIFT ENABLE
PREAMBLE
ALL 1s
BREAK
ALL 0s
TRANSMITTER
CONTROL LOGIC
SHIFT REGISTER
DMATE
TC
SCTIE
TCIE
SCTE
TRANSMITTER CPU INTERRUPT REQUEST
TRANSMITTER DMA SERVICE REQUEST
M
ENSCI
LOOPS
TE
INTERNAL BUS
PRE-
SCALER
SCP1
SCP0
SCR2
SCR1
SCR0
BAUD
DIVIDER
÷ 16
SCTIE
SCI_TxD
CGMXCLK
BUS CLOCK
A
B
SL
X
SL = 0 => X = A
SL = 1 => X = B
CKS