Bosch PPP6 B8 Series Manual de Serviço descarregar pdf (Página 334)

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MSCAN Controller

Technical Data MC68HC912D60A — Rev. 3.1

334 MSCAN Controller Freescale Semiconductor

17.13.5 msCAN12 Bus Timing Register 1 (CBTR1).

SAMP — Sampling

This bit determines the number of samples of the serial bus to be

taken per bit time. If set three samples per bit are taken, the regular

one (sample point) and two preceding samples, using a majority rule.

For higher bit rates SAMP should be cleared, which means that only

one sample will be taken per bit.

0 = One sample per bit.

1 = Three samples per bit.

(1)

TSEG22 – TSEG10 — Time Segment

Time segments within the bit time fix the number of clock cycles per

bit time, and the location of the sample point. (See Figure 17-8)

Time segment 1 (TSEG1) and time segment 2 (TSEG2) are

programmable as shown in Table 17-8.

Bit 7654321Bit 0

CBTR1 R

SAMP TSEG22 TSEG21 TSEG20 TSEG13 TSEG12 TSEG11 TSEG10

$0103 W

RESET 00000000

1. In this case, PHASE_SEG1 must be at least two time quanta.

Table 17-7. Time segment syntax

SYNC_SEG

System expects transitions to occur on the

bus during this period.

Transmit point

A node in transmit mode will transfer a new

value to the CAN bus at this point.

Sample point

A node in receive mode will sample the bus

at this point. If the three samples per bit

option is selected then this point marks the

position of the third sample.

1 2 ... 329 330 331 332 333 334 335 336 337 338 339 ... 459 460

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