Datasheet

Section 15 Controller Area Network for Tiny (TinyCAN)

Rev. 4.00 Mar. 15, 2006 Page 346 of 556

REJ09B0026-0400

Counter Write Error Passive: The TinyCAN can be forced to make a transition to the error-

passive state by writing a value of 127 or higher to the error counter. To write a value to the error

counter, set the HLTRQ bit to 1. A value written to TEC is automatically also written to REC; the

same value is to be written to TEC and REC. Note that the TinyCAN need to be in halt mode to

write a value to TEC and REC. The TinyCAN should communicate in normal mode (TSTMD bit

= 0), since written values of TEC and REC are retained unless the TinyCAN is reset or detects an

error.

Force to Error Passive: The TinyCAN can be forced to make a transition to the error-passive

state by setting the FERPS bit to 1.

15.8 CAN Bus Interface

A bus transceiver IC and a pull-up resistor are necessary to connect this LSI to a CAN bus. A

Renesas Technology HA13721 transceiver IC is recommended. If any other product is used,

confirm that it is compatible with the HA13721. Figure 15.19 shows a sample connection diagram.

HRXD

HTXD

This LSI

Note: NC: Non connection

CAN bus

120 W

Vcc

HA13721

TXD

GND

Vcc

RXD

Mode

CANH

CANL

NC NC

Figure 15.19 High-Speed CAN Bus Interface Using HA13721