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型號(hào)：	UPD70F3357GJ(A)-GAE-AX
元件分類：	微控制器/微處理器
英文描述：	32-BIT, FLASH, 32 MHz, RISC MICROCONTROLLER, PQFP144
封裝：	20 X 20 MM, LEAD FREE, PLASTIC, LQFP-144
文件頁(yè)數(shù)：	946/1119頁(yè)
文件大?。?/td>	6653K
代理商：	UPD70F3357GJ(A)-GAE-AX

CHAPTER 19 CAN CONTROLLER

User’s Manual U17790EJ2V0UD

19.14 Time Stamp Function

CAN is an asynchronous, serial protocol. All nodes connected to the CAN bus have a local, autonomous clock. As

a consequence, the clocks of the nodes have no relation (i.e., the clocks are asynchronous and may even have

different frequencies).

In some applications, however, a common time base over the network (= global time base) is needed. In order to

build up a global time base, a time stamp function is used. The essential mechanism of a time stamp function is the

capture of timer values triggered by signals on the CAN bus.

19.14.1 Time stamp function

The CAN controller supports the capturing of timer values triggered by a specific frame. An on-chip 16-bit capture

timer unit in a microcontroller system is used in addition to the CAN controller. The 16-bit capture timer unit captures

the timer value according to a trigger signal (TSOUT) for capturing that is output when a data frame is received from

the CAN controller. The CPU can retrieve the time of occurrence of the capture event, i.e., the time stamp of the

message received from the CAN bus, by reading the captured value. The TSOUT signal can be selected from the

following two event sources and is specified by the CnTS.TSSEL bit.

SOF event (start of frame)

(TSSEL bit = 0)

EOF event (last bit of end of frame) (TSSEL bit = 1)

The TSOUT signal is enabled by setting the CnTS.TSEN bit to 1.

Figure 19-34. Timing Diagram of Capture Signal TSOUT

The TSOUT signal toggles its level upon occurrence of the selected event during data frame reception (in Figure

19-34, the SOF is used as the trigger event source). To capture a timer value by using the TSOUT signal, the capture

timer unit must detect the capture signal at both the rising edge and falling edge.

This time stamp function is controlled by the CnTS.TSLOCK bit. When the TSLOCK bit is cleared to 0, the TSOUT

signal toggles upon occurrence of the selected event. If the TSLOCK bit is set to 1, the TSOUT signal toggles upon

occurrence of the selected event, but the toggle is stopped as the TSEN bit is automatically cleared to 0 when a data

frame starts to be received and stored in message buffer 0. This suppresses the subsequent toggle occurrence by

the TSOUT signal, so that the time stamp value toggled last (= captured last) can be saved as the time stamp value of

the time at which the data frame was received in message buffer 0.

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