Microcontrollers Data Sheet

Functional Description
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Freescale Semiconductor 161
13.3.2 Transmitter
Figure 13-5 shows the structure of the SCI transmitter.
Figure 13-5. SCI Transmitter
PEN
PTY
H876543210L
11-BIT
TRANSMIT
STOP START
T8
SCTE
SCTIE
TCIE
SBK
TC
f
OP
PARITY
GENERATION
MSB
SCI DATA REGISTER
LOAD FROM SCDR SHIFT ENABLE
PREAMBLE
ALL 1s
BREAK
ALL 0s
TRANSMITTER
CONTROL LOGIC
SHIFT REGISTER
TC
SCTIE
TCIE
SCTE
M
ENSCI
LOOPS
TE
PTF5/TxD
TXINV
INTERNAL BUS
÷ 4
PRE-
SCALER
SCP1
SCP0
SCR1
SCR2
SCR0
BAUD
DIVIDER
÷ 16
TRANSMITTER CPU
INTERRUPT REQUEST