STR720 datasheet(234/401 Pages) STMICROELECTRONICS

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STR720 - CONTROLLER AREA NETWORK (CAN)

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New Data Registers 1 & 2 (CAN_NDnR)

Address Offset: 120h (CAN_ND1R), 124h (CAN_ND2R)

Reset Value: 0000 0000h

These registers hold the NewDat bits of the 32 Message Objects. By reading out the NewDat

bits, the CPU can check for which Message Object the data portion was updated. The

NewDat bit of a specific Message Object can be set/reset by the CPU through the IFn

Message Interface Registers or by the Message Handler after reception of a Data Frame or

after a successful transmission.

NewDat[32:17]

765

432

NewDat[16:1]

Bits 31:16

NewDat32-17 New Data Bits (of all Message Objects)

0: No new data has been written into the data portion of this Message

Object by the Message Handler since the last time this flag was cleared by

the application software.

1: The Message Handler or the application software has written new data

into the data portion of this Message Object.

Bits 15:0

NewDat16-1 New Data Bits (of all Message Objects)

0: No new data has been written into the data portion of this Message

Object by the Message Handler since the last time this flag was cleared by

the application software.

1: The Message Handler or the application software has written new data

into the data portion of this Message Object.

STR720 数据表(PDF) 234 Page - STMicroelectronics