AT89C51CC03U-RDTIM datasheet(102/195 Pages) ATMEL

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102

AT89C51CC03

4182I–CAN–06/05

Time Trigger

Communication (TTC)

and Message Stamping

The AT89C51CC03 has a programmable 16-bit Timer (CANTIMH and CANTIML) for

message stamp and TTC.

This CAN Timer starts after the CAN controller is enabled by the ENA bit in the CANG-

CON register.

Two modes in the timer are implemented:

•

Time Trigger Communication:

–

Capture of this timer value in the CANTTCH and CANTTCL registers on

Start Of Frame (SOF) or End Of Frame (EOF), depending on the SYNCTTC

bit in the CANGCON register, when the network is configured in TTC by the

TTC bit in the CANGCON register.

Note:

In this mode, CAN only sends the frame once, even if an error occurs.

•

Message Stamping

–

Capture of this timer value in the CANSTMPH and CANSTMPL registers of

the message object which received or sent the frame.

–

All messages can be stamps.

–

The stamping of a received frame occurs when the RxOk flag is set.

–

The stamping of a sent frame occurs when the TxOk flag is set.

The CAN Timer works in a roll-over from FFFFh to 0000h which serves as a time base.

When the timer roll-over from FFFFh to 0000h, an interrupt is generated if the ETIM bit

in the interrupt enable register IEN1 is set.

Figure 55. Block Diagram of CAN Timer

EOF on CAN frame

ENA

CANGCON.1

CANTCON

RXOK i

CANSTCH.5

TXOK i

CANSTCH.4

÷ 6

Fcan

CLOCK

SOF on CAN frame

TTC

CANGCON.5

SYNCTTC

CANGCON.4

CANTTCH and CANTTCL

CANSTMPH and CANSTMPL

CANTIMH and CANTIML

OVRTIM

CANGIT.5

When 0xFFFF to 0x0000

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