MC68HC11K0CFUE4 Freescale Semiconductor, MC68HC11K0CFUE4 Datasheet - Page 157

• Manufacturer Part Number: MC68HC11K0CFUE4
• Description: MCU 8-BIT 768 RAM 4MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC11K0CFUE4

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Type: ROMless
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 37
• Number Of Timers: 8
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details

7.7 Short Mode Idle Line Detection
7.8 Baud Rate Selection
M68HC11K Family
MOTOROLA
EXTAL
NOTE:
SCBDH/L SCI BAUD RATE
13-BIT COMPARE
13-BIT COUNTER
Figure 7-4. SCI Baud Generator Circuit Diagram
CONTROL
This feature can increase system communication speed by reducing the
amount of time between messages. Setting the ILT bit in SCCR1 allows
the SCI receiver to detect the consecutive 1s of an idle period before the
stop bit of an incoming character is received. If the last few bits of the
character are 1s, they are counted as the first high bits in the frame of 1s
comprising the idle period following the character.
Extra care may be needed to prevent premature detection of an idle line
condition.
The baud rate generator for the SCI includes a 13-bit modulus prescaler
driven by the system crystal clock (EXTAL). Writing to the SCI baud rate
register (SCBDH/L) selects the prescaler value. See
Freescale Semiconductor, Inc.
For More Information On This Product,
Serial Communications Interface (SCI)
Go to: www.freescale.com
RESET
2
INTERNAL
PHASE 2
CLOCK
SYNCH
Serial Communications Interface (SCI)
Short Mode Idle Line Detection
16
Figure
TRANSMITTER
Technical Data
BAUD RATE
BAUD RATE
RECEIVER
7-4.
CLOCK
CLOCK
157