M16CSLASH1N datasheet(156/238 Pages) RENESAS

156 / 238 page

Rev.1.00

Oct 20, 2004

page 144 of 222

M16C/1N Group

16. CAN Module

REJ09B0007-0100Z

16.5 Operational Modes

The CAN module has the following three operational modes.

• CAN Reset/Initialization Mode

• CAN Sleep Mode

• CAN Operation Mode

Figure 16.16 shows transition between operational modes.

Figure 16.16 Transition Between Operational Modes

16.5.1 CAN Reset/Initialization Mode

CAN reset/initialization mode is activated upon MCU reset or by setting the Reset bit of the C0CTLR

"1". Entering CAN reset/initialization mode, the module initiates the following functions:

• Suspend all communication functions. When the CAN reset/initialization mode is activated during

an ongoing transmission in operation mode, the module suspends the mode transition until

completion of the transmission (successful, arbitration loss, or error detection) and then sets the

State_Reset bit.

• The C0IDR, C0MCTLi (i = 0 to 15), C0ICR, C0STR, C0RECR and C0TECR registers are initial-

ized. All these registers are locked to prevent CPU modification.

• The C0CTLR, C0CONR, C0GMR, C0LMAR and C0LMBR registers and the CAN0 message box

retain their contents and are available for CPU access.

MCU Reset

CAN

Reset/initialization

mode

(State_Reset = 1)

CAN

Operation mode

(State_Reset = 0)

CAN Sleep mode

Bus off state

(State_Bus off = 1)

Reset = 0

Reset = 1

Reset, Sleep, RetBusOff : C0CTLR register’s bits

State_Reset, State_BusOFF : C0STR register’s bits

Sleep = 1

and

Reset = 0

Sleep = 0

and

Reset = 1

TEC > 255

When 11 consecutive

recessive bits are monitored

128 times on the bus or

RetBusOff = 1

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