MC68HC711P2CFN4 Freescale Semiconductor, MC68HC711P2CFN4 Datasheet - Page 113

• Manufacturer Part Number: MC68HC711P2CFN4
• Description: IC MCU 32K OTP 4MHZ 84-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711P2CFN4

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: MI Bus, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 640 x 8
• Ram Size: 1K 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: 84-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

6.6 Biphase coding
6.7 Message validation
MC68HC11P2 — Rev 1.0
Biphase coded signal
Biphase detection
Noise detection
Figure 6-2. Biphase coding and error detection
Manchester biphase L coding is used for the push field bits. Each bit
requires two time slots to encode the logic value of the bit. This encoding
allows the detection of a single error at the time slot level. Bits are
encoded as follows:
The communication between the MCU and the selected device is valid
when the MCU reads a pull data field having correct codes (excluding
the codes ‘111’ and ‘000’) followed by a square wave signal, having a
frequency of 20kHz, contained in the end-of-frame information.
An MI BUS error is detected when the pull field contains the code ‘111’
followed by the end-of-frame permanently tied to logical state ‘1’. This
means that the communication between the MCU and the selected
device was not accomplished.
Freescale Semiconductor, Inc.
0
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a’
1 = In the first time slot, the logic level is set to zero, followed by a
0 = In the first time slot, the logic level is set to one, followed by a
1
a
a
Motorola Interconnect Bus (MI BUS)
logic level one in the second time slot;
logic level zero in the second time slot.
2
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3
‘0’
4
b’
5
b
b
6
7
0
a’
1
a
a
2
Motorola Interconnect Bus (MI BUS)
3
‘1’
4
b’
5
b
b
6
7
Biphase coding
Technical Data
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