mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 215

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC08QA24
Freescale Semiconductor
SCP1
SCP0
SCR1
SCR2
SCR0
÷ 4
SCALER
PRE-
At the start of a transmission, transmitter control logic automatically
loads the transmit shift register with a preamble of 10 or 11 logic 1s. After
the preamble shifts out, control logic transfers the SCDR data into the
DIVIDER
BAUD
3. Enable the transmitter by writing a logic 1 to the transmitter enable
4. Clear the SCI transmitter empty bit (SCTE) by first reading SCI
5. Repeat step 3 for each subsequent transmission.
PEN
PTY
TXINV
bit (TE) in SCI control register 2 (SCC2) ($0014).
status register (SCS1) ($0016) and then writing to the SCDR
($0018).
Serial Communications Interface (SCI)
Figure 17-4. SCI Transmitter
÷ 16
GENERATION
PARITY
SCTIE
TC
TCIE
SCTE
T8
M
H
8
SCTIE
7
SCTE
TCIE
TC
SCI DATA REGISTER
6
SHIFT REGISTER
INTERNAL BUS
TRANSMIT
5
11-BIT
CONTROL LOGIC
4
TRANSMITTER
3
2
Serial Communications Interface (SCI)
1
LOOPS
ENSCI
SBK
TE
0
L
Technical Data
PTE0/TxD
213