MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 110

• 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

Freescale Semiconductor, Inc.
If the receiver detects that a break (RDRF = 1, FE = 1, receiver data register = $0000) produced
the framing error, the start bit will not be artificially induced and the receiver must actually detect
a logic one before the start bit can be recognised (see
Figure
7-7).
Data
Expected stop
Artificial edge
Data
RDI
Start bit
Data samples
a) Case 1: receive line low during artificial edge
Data
Expected stop
Start edge
Data
RDI
Start bit
Data samples
7
b) Case 2: receive line high during expected start edge
Figure 7-6 Artificial start following a framing error
Expected stop
Detected as valid start edge
Break
Start bit
RDI
Start
Start edge
qualifiers
verification
Data samples
samples
Figure 7-7 SCI start bit following a break
7.9
Transmit data out (TDO)
Transmit data is the serial data from the internal data bus that is applied through the SCI to the
output line. Data format is as discussed in
Section 7.5
and shown in
Figure
7-3. The transmitter
generates a bit time by using a derivative of the RT clock, thus producing a transmission rate equal
to 1/16th that of the receiver sample clock (assuming the same baud rate is selected for both the
receiver and transmitter).
SERIAL COMMUNICATIONS INTERFACE
MC68HC05X16
For More Information On This Product,
Rev. 1
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