MC68HC705C8ACB Freescale Semiconductor, MC68HC705C8ACB Datasheet - Page 123
MC68HC705C8ACB
Manufacturer Part Number
MC68HC705C8ACB
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68HC705C8ACB.pdf
(222 pages)
Specifications of MC68HC705C8ACB
Cpu Family
HC05
Device Core Size
8b
Frequency (max)
2.1MHz
Interface Type
SCI/SPI
Program Memory Type
EPROM
Program Memory Size
8KB
Total Internal Ram Size
304Byte
# I/os (max)
24
Number Of Timers - General Purpose
1
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
3V
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Through Hole
Pin Count
42
Package Type
SPDIP
Lead Free Status / Rohs Status
Not Compliant
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10.5 SCI Operation
10.5.1 Transmitter
MC68HC705C8A — Rev. 3
MOTOROLA
START
START
BIT
BIT
BIT 0
BIT 0
The SCI allows full-duplex, asynchronous, RS232 or RS422 serial
communication between the MCU and remote devices, including other
MCUs. The transmitter and receiver of the SCI operate independently,
although they use the same baud-rate generator. This subsection
describes the operation of the SCI transmitter and receiver.
Figure 10-2
summary of the SCI transmitter input/output (I/O) registers.
BIT 1
BIT 1
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
Character Length — The transmitter can accommodate either
8-bit or 9-bit data. The state of the M bit in SCI control register 1
(SCCR1) determines character length. When transmitting 9-bit
data, bit T8 in SCCR1 is the ninth bit (bit 8).
Character Transmission — During transmission, the transmit shift
register shifts a character out to the PD1/TDO pin. The SCI data
register (SCDR) is the write-only buffer between the internal data
bus and the transmit shift register.
BIT 2
BIT 2
Serial Communications Interface (SCI)
Figure 10-1. SCI Data Format
Go to: www.freescale.com
shows the structure of the SCI transmitter.
BIT 3
BIT 3
(BIT M IN SCCR1 CLEAR)
(BIT M IN SCCR1 SET)
8-BIT DATA FORMAT
9-BIT DATA FORMAT
BIT 4
BIT 4
BIT 5
BIT 5
BIT 6
BIT 6
BIT 7
BIT 7
Serial Communications Interface (SCI)
STOP
BIT 8
BIT
START
NEXT
STOP
BIT
BIT
Figure 10-3
START
NEXT
BIT
Technical Data
SCI Operation
is a
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