32186 datasheet(678/1032 Pages) RENESAS

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CAN MODULE

13-68

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

CRX pin

CTX pin

Self-diagnostic mode

ACK signal

generating

circuit

M32R/ECU CAN module

13.2.10 CAN Mode Registers

CAN0 Mode Register (CAN0MOD)

<Address: H’0080 1018>

CAN1 Mode Register (CAN1MOD)

<Address: H’0080 1418>

123456

CMOD

Bit Name

Function

0–5

No function assigned. Fix to "0."

6–7

CMOD

00: Normal mode

CAN operation mode select bit

01: Bus monitor mode

10: Self-diagnostic mode

11: Settings inhibited

(1) CMOD (CAN Operation Mode Select) bits (Bits 6, 7)

These bits select the CAN operation mode.

• Normal operation mode

Normal transmit/receive operations can be performed.

• Bus monitor mode

Only receive operation is performed. During bus monitor mode, the CTX output is fixed "H" and neither

ACK nor an error frame can be returned.

Note: • During bus monitor mode, issuing transmit requests is inhibited. The ACK bit is handled as

“Don’t care” during bus monitor mode. Therefore, if all bits of data including the CRC

delimiter are received normally, it is assumed that data has been received normally no

matter whether the ACK bit is "H."

• Self-diagnostic mode

CTX and CRX are connected together internally in the CAN module. When combined with loopback

mode, this mode allows communication to be performed within the CAN module alone. During self-

diagnostic mode, the CTX pin output is fixed "H" even when transmitting.

Figure 13.2.24 Conceptual Diagram of Self-Diagnostic Mode

13.2 CAN Module Related Registers

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