MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 214
MC68HC08AZ60ACFU
Manufacturer Part Number
MC68HC08AZ60ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC08AZ60ACFU.pdf
(480 pages)
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Serial Communications Interface (SCI)
16.5.2 Transmitter
16.5.2.1 Character Length
16.5.2.2 Character Transmission
Advance Information
214
Figure 16-4
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).
During an SCI transmission, the transmit shift register shifts a character
out to the TxD pin. The SCI data register (SCDR) is the write-only buffer
between the internal data bus and the transmit shift register. To initiate
an SCI transmission:
At the start of a transmission, transmitter control logic automatically
loads the transmit shift register with a preamble of logic 1s. After the
1. Enable the SCI by writing a logic 1 to the enable SCI bit (ENSCI)
2. Enable the transmitter by writing a logic 1 to the transmitter enable
3. Clear the SCI transmitter empty bit (SCTE) by first reading SCI
4. Repeat step 3 for each subsequent transmission.
START
START
BIT
BIT
in SCI control register 1 (SCC1).
bit (TE) in SCI control register 2 (SCC2).
status register 1 (SCS1) and then writing to the SCDR.
Serial Communications Interface (SCI)
BIT 0
BIT 0
shows the structure of the SCI transmitter.
BIT 1
BIT 1
BIT 2
BIT 2
Figure 16-3. SCI Data Formats
BIT 3
BIT 3
(BIT M IN SCC1 CLEAR)
8-BIT DATA FORMAT
9-BIT DATA FORMAT
(BIT M IN SCC1 SET)
BIT 4
BIT 4
BIT 5
BIT 5
BIT 6
BIT 6
OR DATA
PARITY
BIT 7
BIT 7
BIT
MC68HC08AZ60A — Rev 0.0
OR DATA
PARITY
STOP
BIT 8
BIT
BIT
START
STOP
NEXT
BIT
BIT
MOTOROLA
START
NEXT
BIT
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