XC68HC12A0CPV8 Freescale Semiconductor, XC68HC12A0CPV8 Datasheet - Page 291

• Manufacturer Part Number: XC68HC12A0CPV8
• Description: IC, 16BIT MCU, 68HC12, 8MHZ, TQFP-112
• Manufacturer: Freescale Semiconductor

Specifications of XC68HC12A0CPV8

• Controller Family/series: 68HC12
• No. Of I/o's: 68
• Eeprom Memory Size: 1KB
• Ram Memory Size: 2KB
• Cpu Speed: 8MHz
• No. Of Timers: 1
• Core Size: 16 Bit
• Program Memory Size: 60KB
• Peripherals: ADC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

16.3.1 The push field
16.3.2 The pull field
16.4 Biphase coding
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
The push field consists of a start bit, a push synchronization bit, a push
data field and a push address field. The start consists of three time slots
having the dominant logical state ‘0’. The start marks the beginning of
the message frame by violation of the rule of the Manchester code. The
push synchronization bit consists of a biphase coded ‘0’. Biphase coding
will be discussed later. The push data field consists of five bits of biphase
coded data. The push address consists of three bits of biphase coded
data. Data and address are written to the lower byte of the SCI data
register (SC0DRL). The push data occupies the lower five bits and the
push address occupies the upper three bits of the register.
The pull field consists of a pull synchronization bit, a pull data field and
an end of frame. The pull synchronization bit is a biphase coded ‘1’ and
is initiated by the MCU during the time slot after the last address bit of
the push field. The pull data field consists of an NRZ coded transmission,
each bit taking one time slot. Once shifted in, the pull data is stored in
the lower byte of the SCI data register (SC0DRL). The end-of-frame field
is a square wave signal having a typical frequency of 20kHz ± 1%
tolerance (i.e. the bit rate of the push field) when the data sent to the
selected device is valid.
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:
0 = In the first time slot, the logic level is set to one, followed by a
1 = In the first time slot, the logic level is set to zero, followed by a
logic level zero in the second time slot.
logic level one in the second time slot.
Freescale Interconnect Bus
Freescale Interconnect Bus
Biphase coding
Technical Data
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