UPD70F3786GJ-GAE-AX Renesas Electronics America, UPD70F3786GJ-GAE-AX Datasheet - Page 1144

• Manufacturer Part Number: UPD70F3786GJ-GAE-AX
• Description: MCU 32BIT V850ES/JX3-E 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Er

Specifications of UPD70F3786GJ-GAE-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: CAN, CSI, EBI/EMI, Ethernet, I²C, UART/USART, USB
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 100
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 124K x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 3.6 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

21.14 Time Stamp Function
a consequence, the clocks of the nodes have no relation (i.e., the clocks are asynchronous and may even have
different frequencies).
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.
21.14.1 Time stamp function
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 C0TS.TSSEL bit.
21-34, 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.
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.
1142
CAN is an asynchronous, serial protocol. All nodes connected to the CAN bus have a local, autonomous clock. As
In some applications, however, a common time base over the network (= global time base) is needed. In order to
The CAN controller supports the capturing of timer values triggered by a specific frame. An on-chip 16-bit capture
• SOF event (start of frame)
• EOF event (last bit of end of frame) (TSSEL bit = 1)
The TSOUT signal is enabled by setting the C0TS.TSEN bit to 1.
The TSOUT signal toggles its level upon occurrence of the selected event during data frame reception (in Figure
This time stamp function is controlled by the C0TS.TSLOCK bit. When the TSLOCK bit is cleared to 0, the TSOUT
TSOUT
SOF
Figure 21-35. Timing Diagram of Capture Signal TSOUT
CHAPTER 21 CAN CONTROLLER
(TSSEL bit = 0)
SOF
User’s Manual U19601EJ2V0UD
SOF
SOF
t