MC56F8257MLH Freescale Semiconductor, MC56F8257MLH Datasheet - Page 372

• Manufacturer Part Number: MC56F8257MLH
• Description: DSC 64K FLASH 60MHZ 64-LQFP
• Manufacturer: Freescale Semiconductor
• Series: 56F8xxxr

Specifications of MC56F8257MLH

• Core Processor: 56800E
• Core Size: 16-Bit
• Speed: 60MHz
• Connectivity: CAN, I²C, LIN, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Ram Size: 4K x 16
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x12b, D/A 1x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 64-LQFP
• Product: DSCs
• Processor Series: 56800E
• Core: 56800E
• Device Million Instructions Per Second: 60 MIPs
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 54
• Data Ram Size: 8 KB
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Functional Description
In the following figure, the verification samples RT3 and RT5 determine that the first low
detected was noise and not the beginning of a start bit. The RT clock is reset and the start
bit search begins again. The noise flag is not set because the noise occurred before the
start bit was found.
In the following figure, noise is perceived as the beginning of a start bit because the
verification sample at RT3 is high. The RT3 sample sets the noise flag. Although the
perceived bit time is misaligned, the data samples RT8, RT9, and RT10 are within the bit
time and data recovery is successful.
372
RT8, RT9, and RT10 Samples
000
001
010
011
100
101
110
111
MC56F825x/4x Reference Manual, Rev. 2, 10/2010
Figure 11-21. Start Bit Search Example 1
Table 11-26. Stop Bit Recovery
Framing Error Flag
Preliminary
1
1
1
0
1
0
0
0
Freescale Semiconductor
Noise Flag
0
1
1
1
1
1
1
0