MC68HC08AZ16 Datasheet, PDF (175/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Serial Communications Interface Module (SCI)
Transmitter
Figure 2 shows the structure of the SCI transmitter.
INTERNAL BUS
÷4
PRE- BAUD
SCALER DIVIDER
÷ 16
SCP1
SCP0
SCR1
SCR2
SCR0
TXINV
SCI DATA REGISTER
11-BIT
TRANSMIT
SHIFT REGISTER
H8 7 6 5 4 3 2 1 0 L
PEN
PTY
M
PARITY
GENERATION
T8
DMATE
DMATE
SCTIE
SCTE
DMATE
SCTE
SCTIE
TC
TCIE
TRANSMITTER
CONTROL LOGIC
SCTE
SCTIE
TC
TCIE
SBK
LOOPS
ENSCI
TE
PTE2/TxD
MC68HC08AZ32
174
Figure 2. SCI transmitter
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).
Serial Communications Interface Module (SCI)
6-sci
MOTOROLA