04.03.2013 Views

RL78/D1A User's Manual: Hardware - Renesas

RL78/D1A User's Manual: Hardware - Renesas

RL78/D1A User's Manual: Hardware - Renesas

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Under development<br />

Preliminary document<br />

Specifications in this document are tentative and subject to change.<br />

<strong>RL78</strong>/<strong>D1A</strong> CHAPTER 14 CAN CONTROLLER<br />

14.15 Baud Rate Settings<br />

14.15.1 Baud rate settings<br />

Make sure that the settings are within the range of limit values for ensuring correct operation of the CAN controller, as<br />

follows.<br />

(a) 5TQ SPT (sampling point) 17TQ<br />

SPT = TSEG1 + 1TQ<br />

(b) 8TQ DBT (data bit time) 25TQ<br />

DBT = TSEG1 + TSEG2 + 1TQ = TSEG2 + SPT<br />

(c) 1TQ SJW (synchronization jump width) 4TQ<br />

SJW DBT – SPT<br />

(d) 4TQ TSEG1 16TQ [3 (Setting value of TSEG1 [3:0] 15]<br />

(e) 1TQ TSEG2 8TQ [0 (Setting value of TSEG2 [2:0] 7]<br />

Remark TQ = 1/fTQ (fTQ: CAN protocol layer basic system clock)<br />

TSEG1 [3:0]: Bits 3 to 0 of CAN0 bit rate register (C0BTR)<br />

TSEG2 [2:0]: Bits 10 to 8 of CAN0 bit rate register (C0BTR)<br />

Table 14-22 shows the combinations of bit rates that satisfy the above conditions.<br />

R01UH0317EJ0004 Rev. 0.04 911<br />

Feb. 22, 2013

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!