STR720 datasheet(250/401 Pages) STMICROELECTRONICS

部件名	STR720

功能描述	ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES

PDF	401 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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250 / 401 page

STR720 - CONTROLLER AREA NETWORK (CAN)

250/401

A given bit rate may be met by different bit time configurations, but for the proper function of

the CAN network the physical delay times and the oscillator’s tolerance range have to be

considered.

Figure 35. Bit Timing

Table 56. CAN Bit Time Parameters

Parameter

Range

Remark

BRP

[1 .. 32]

defines the length of the time quantum tq

Sync_Seg

1 tq

fixed length, synchronization of bus input to system clock

Prop_Seg

[1.. 8] tq

compensates for the physical delay times

Phase_Seg1

[1..8] tq

may be lengthened temporarily by synchronization

Phase_Seg2

[1.. 8] tq

may be shortened temporarily by synchronization

SJW

[1 .. 4] tq

may not be longer than either Phase Buffer Segment

This table describes the minimum programmable ranges required by the CAN protocol

1 Time Quantum

)

Sync_

Prop_Seg

Phase_Seg1

Phase_Seg2

Sample Point

Nominal CAN Bit Time

Seg

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