SH7261 datasheet(890/1348 Pages) RENESAS

890 / 1348 page

Section 19 Controller Area Network (RCAN-ET) [R5S72611] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 858 of 1312

REJ09B0320-0200

(2)

Halt mode

When RCAN-ET is in Halt mode, it cannot take part to the CAN bus activity. Consequently the

user can modify all the requested registers without influencing existing traffic on the CAN Bus. It

is important for this that the user waits for the RCAN-ET to be in halt mode before to modify the

requested registers - note that the transition to Halt Mode is not always immediate (transition will

occurs when the CAN Bus is idle or in intermission). After RCAN-ET transit to Halt Mode, GSR4

is set.

Once the configuration is completed the Halt request needs to be released. RCAN-ET will join

CAN Bus activity after the detection of 11 recessive bits on the CAN Bus.

(3)

Sleep mode

When RCAN-ET is in sleep mode the clock for the main blocks of the IP is stopped in order to

reduce power consumption. Only the following user registers are clocked and can be accessed:

MCR, GSR, IRR and IMR. Interrupt related to transmission (TXACK and ABACK) and reception

(RXPR and RFPR) cannot be cleared when in sleep mode (as TXACK, ABACK, RXPR and

RFPR are not accessible) and must to be cleared beforehand.

The following diagram shows the flow to follow to move RCAN-ET into sleep mode.

SH7261 Datasheet(PDF) 890 Page - Renesas Technology Corp