MC68HC08AZ32A Datasheet, PDF (176/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Serial Communications Interface (SCI)
14.4.2 Transmitter
Figure 14-5 shows the structure of the SCI transmitter.
14.4.2.1 Character Length
The transmitter can accommodate either 8-bit or 9-bit data. The state of the M bit in SCI control register 1
(SCC1) determines character length. When transmitting 9-bit data, bit T8 in SCI control register 3 (SCC3)
is the ninth bit (bit 8).
INTERNAL BUS
÷4
PRE-
BAUD
SCALER DIVIDER
÷ 16
SCI DATA REGISTER
SCP1
SCP0
SCR1
SCR2
SCR0
11-BIT
TRANSMIT
SHIFT REGISTER
H876543210L
TxD
TXINV
M
PEN
PARITY
PTY
GENERATION
T8
TRANSMITTER
CONTROL LOGIC
SCTE
SCTIE
TC
TCIE
SCTE
SCTIE
TC
TCIE
Figure 14-5. SCI Transmitter
SBK
LOOPS
ENSCI
TE
MC68HC08AZ32A Data Sheet, Rev. 2
176
Freescale Semiconductor