UPD70F3771GF-GAT-AX Renesas Electronics America, UPD70F3771GF-GAT-AX Datasheet - Page 979

• Manufacturer Part Number: UPD70F3771GF-GAT-AX
• Description: MCU 32BIT V850ES/JX3-H 128-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Hr

Specifications of UPD70F3771GF-GAT-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 48MHz
• Connectivity: CAN, CSI, EBI/EMI, I²C, UART/USART, USB
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 96
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 3.6 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

V850ES/JG3-H, V850ES/JH3-H
20.8 CAN Controller Initialization
20.8.1 Initialization of CAN module
C0GMCS.CCP0 to C0GMCS.CCP3 bits by software. Do not change the setting of the CAN module system clock after
CAN module operation is enabled.
20.8.2 Initialization of message buffer
message buffers, even for those not used in the application, is necessary before switching the CAN module from the
initialization mode to one of the operation modes.
20.8.3 Redefinition of message buffer
being received or transmitted, without affecting other transmission/reception operations.
R01UH0042EJ0400 Rev.4.00
Sep 30, 2010
Before CAN module operation is enabled, the CAN module system clock needs to be determined by setting the
The CAN module is enabled by setting the C0GMCTRL.GOM bit.
For the procedure of initializing the CAN module, see 20.16 Operation of CAN Controller.
After the CAN module is enabled, the message buffers contain undefined values. A minimum initialization for all the
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•
Remark
Redefining a message buffer means changing the ID and control information of the message buffer while a message is
(1) To redefine message buffer in initialization mode
(2) To redefine message buffer during reception
(3) To redefine message buffer during transmission
Clear the C0MCTRLm.RDY, C0MCTRLm.TRQ, and C0MCTRLm.DN bits to 0.
Clear the C0MCONFm.MA0 bit to 0.
Place the CAN module in the initialization mode once and then change the ID and control information of the
message buffer in the initialization mode. After changing the ID and control information, set the CAN module to an
operation mode.
Perform redefinition as shown in Figure 20-39.
To rewrite the contents of a transmit message buffer to which a transmission request has been set, perform
transmission abort processing (see 20.10.4 (1) Transmission abort process other than in normal operation
mode with automatic block transmission (ABT), 20.10.4 (2) Transmission abort process except for ABT
transmission in normal operation mode with automatic block transmission (ABT)).
transmission has been aborted or completed, and then redefine the message buffer. After redefining the transmit
message buffer, set a transmission request using the procedure described below. When setting a transmission
request to a message buffer that has been redefined without aborting the transmission in progress, however, the 1-
bit wait time is not necessary.
m = 00 to 31
CHAPTER 20 CAN CONTROLLER
Page 979 of 1509
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