参数资料
型号: ST72511R9T3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 12/164页
文件大小: 1043K
代理商: ST72511R9T3/XXX
ST72311R, ST72511R, ST72512R, ST72532R
109/164
CONTROLLER AREA NETWORK (Cont’d)
– ERROR. The error management as described in
the CAN protocol is completely handled by hard-
ware using 2 error counters which get increment-
ed or decremented according to the error
condition. Both of them may be read by the appli-
cation to determine the stability of the network.
Moreover, as one of the node status bits (EPSV
or BOFF of the CSR register) changes, an inter-
rupt is generated if the SCIE bit is set in the ICR
Register. Refer to Figure 58.
Figure 58. CAN Error State Diagram
ERROR PASSI VE
When TECR or RECR > 127, the EPSV bit gets set
When TECR and RECR < 128,
and the EPSV bit gets cleared
ERROR ACTI VE
BUS OFF
When TECR > 255 the BOFF bit gets set
When 128 * 11 recessive bits occur:
- the BOFF bit gets cleared
- the TECR register gets cleared
- the RECR register gets cleared
the EPSV bit gets cleared
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