32186 datasheet(644/1032 Pages) RENESAS

644 / 1032 page

CAN MODULE

13-34

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

13.2.5 CAN Timestamp Count Registers

CAN0 Timestamp Count Register (CAN0TSTMP)

<Address: H’0080 1008>

CAN1 Timestamp Count Register (CAN1TSTMP)

<Address: H’0080 1408>

b15

CANTSTMP

0000000000000000

Bit Name

Function

0–15

CANTSTMP

16-bit timestamp count value

–

The CAN module contains a 16-bit up-count register. The count period can be selected from the CAN bus bit period

divided by 1, 2, 3 or 4 by setting the CAN Control Register (CAN0CNT, CAN1CNT) TSP (Timestamp Prescaler) bits.

When the CAN module finishes sending or receiving, it captures the count register value and stores the value in a

message slot. The counter is made to start counting by clearing the CAN Control Register (CAN0CNT, CAN1CNT)

RST bit to "0."

Notes: • The CAN protocol control unit can be reset and the counter initialized to H’0000 by setting the

CAN Control Register (CAN0CNT, CAN1CNT) RST (CAN Reset) bit to "1." Or the counter can

be initialized to H’0000 while the CAN module remains operating by setting the TSR

(Timestamp Counter Reset) bit to "1."

• If any slot with the matching ID exists during loopback mode, the CAN module stores the

timestamp value in that slot when it finished receiving. (No timestamp values are stored this

way when the CAN module finished sending.)

• The count period of the CAN Timestamp Count Register varies with the CAN

resynchronization function.

13.2 CAN Module Related Registers

32186 Datasheet(PDF) 644 Page - Renesas Technology Corp