33989 datasheet(33/66 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33989

FUNCTIONAL DEVICE OPERATION

LOGIC COMMANDS AND REGISTERS

High-Speed CAN Transceiver Modes

The mode bit (D0) controls the state of the CAN module,

Normal or Sleep modes. Please see Table 16. SC0 bit (D1)

defines the slew rate when the CAN module is in Normal

mode, and controls the wake-up option (wake-up enable or

disable) when the CAN module is in Sleep mode. CAN

module modes (Normal and Sleep) are independent of the

SBC modes. Please see Table 17.

Error bits are latched in the CAN registers. Bit (1) CUR is

set to 1 when the CAN interface is programmed into CAN

NORMAL for the first time after V2 turn ON. To clear the CUR

bit, follow this procedure:

• Turn V2 ON (SBC in Normal mode and V2 above V2

threshold) the CAN interface must be set into CAN Sleep

• Return to CAN NORMAL

Input/Output Control Register (IOR)

Table 18 provides data about HS1 control in Normal and

Standby modes, while Table 19 provides control bit data.

When HS1 is turned OFF due to an over temperature

condition, it can be turned ON again by setting the

appropriate control bit to 1. Error bits are latched in the Input/

Output Registers (IOR). Please see Table 20.

Table 16. CAN High-Speed Transceiver Modes

SC1

SC0

MODE

CAN Mode

CAN Normal, Slew Rate 0

CAN Normal, Slew Rate 1

CAN Normal, Slew Rate 2

CAN Normal, Slew Rate 3

CAN Sleep and CAN Wake-up Disable

CAN Sleep and CAN Wake-up Enable

Table 17. CAN Status Bits

Status Bits

Description

CANWU

CAN Wake-up Occurred

TXF

Permanent Dominant TX

CUR(1)

CAN Transceiver in Current Limitation

THERM

CAN Transceiver in Thermal Shutdown

Table 18. IOR Register

IOR

$011B

—

HS1ON

—

V2LOW

HS1OT

VSUPLOW

DEBUG

Reset Value

—

Reset Condition

—

POR

—

Table 19. IOR Control Bits

HS1ON

HS1 State

HS1 OFF, in Normal and Standby Modes

HS1 ON, in Normal and Standby Modes

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