Rainbow-electronics ATmega64M1 Manuale Utente Scaricare il pdf (Pagina 172)

100

101

172

8209A–AVR–08/09

ATmega16M1/32M1/64M1

The total number of TQ in a bit time has to be programmed at least from 8 to 25.

Figure 20-7. Sample and Transmission Point

Figure 20-8. General Structure of a Bit Period

Bit Timing

Sample

Point

Transmission

Point

Prescaler BRP

PRS (3-bit length)

SJW (2-bit length)

PHS1 (3-bit length)

PHS2 (3-bit length)

CLK

Fcan (Tscl)

Time Quantum

Bit Rate Prescaler

CLK

CAN

Data

Tscl (TQ)

CLK

one nominal bit

Tsyns(5)

Tphs2+Tsjw (

)Tphs1+Tsjw (

)

Tbit

Tphs2 (

)Tphs1 (

)Tprs

Sample

Point

Transmission

Point

5. Synchronization Segment: SYNS

Tsyns=1

Tscl (

fixed

)

Notes: 1. Phase error < 0

2. Phase error > 0

3. Phase error > 0

4. Phase error < 0

or or

1 2 ... 167 168 169 170 171 172 173 174 175 176 177 ... 342 343

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