MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 103

• Manufacturer Part Number: MC68HC705X32CFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC705X32CFU

• Cpu Family: HC05
• Device Core Size: 8b
• Frequency (max): 4MHz
• Interface Type: SCI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 528Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

A full-duplex asynchronous serial communications interface (SCI) is provided with a standard
non-return-to-zero (NRZ) format and a variety of baud rates. The SCI transmitter and receiver are
functionally independent and have their own baud rate generator; however they share a common
baud rate prescaler and data format.
The serial data format is standard mark/space (NRZ) and provides one start bit, eight or nine data
bits, and one stop bit.
The SCLK pin is the output of the transmitter clock. It outputs the transmitter data clock for
synchronous transmission (no clocks on start bit and stop bit, and a software option to send clock
on last data bit). This allows control of peripherals containing shift registers (e.g. LCD drivers).
Phase and polarity of these clocks are software programmable.
Any SCI bidirectional communication requires a two-wire system: receive data in (RDI) and
transmit data out (TDO).
‘Baud’ and ‘bit rate’ are used synonymously in the following description.
7.1
•
•
•
•
•
•
•
•
•
•
MC68HC05X16
Standard NRZ (mark/space) format
Advanced error detection method with noise detection for noise duration of up to 1/16th bit time
Full-duplex operation (simultaneous transmit and receive)
32 software selectable baud rates
Different baud rates for transmit and receive; for each transmit baud rate, 8 possible receive
baud rates
Software selectable word length (eight or nine bits)
Separate transmitter and receiver enable bits
Capable of being interrupt driven
Transmitter clocks available without altering the regular transmitter or receiver functions
Four separate enable bits for interrupt control
SERIAL COMMUNICATIONS INTERFACE
SCI two-wire system features
Freescale Semiconductor, Inc.
For More Information On This Product,
SERIAL COMMUNICATIONS INTERFACE
Go to: www.freescale.com
7
7-1
7