Analog Integrated Circuit Device Data

38

Freescale Semiconductor

33389

FUNCTIONAL DEVICE OPERATION

LOGIC COMMANDS AND REGISTERS

This register reports the real time information on the state; (High or Low) of the L0, L1, and L2 inputs. The bits WUIRT1 2:0

contain the real time logic value coming from the wake-up inputs (0 means input below threshold, 1 means input above threshold.

Typical threshold is 3.5 V).

This register reports the CANH failure status.

Table 32. WUISR Bit Definition

WUISR2

WUISR1

WUISR0

Description

0

0

0

No Event on Wake-Up Inputs

x

x

1

Event on L0

x

1

x

Event on L1

1

x

x

Event on L2

In case of a wake-up event, the appropriate bit is set to 1. The bits will be reset by a Read operation of the register. After

power-ON reset, all bits are set to 0.

Table 33. Wake-Up Input Real Time Information (WUIRTI)

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

WUIRTI

$011

R

WUIRTI2

WUIRTI1

WUIRTI0

W

RESET

—

—

—

—

—

0

0

0

Table 34. Over Temperature Status Register (OTSR)

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

OTSR

$012

R

OPWV2

OPWV1

OPTV2

OTV1

W

OTV2C

RESET

—

—

—

—

0

0

0

0

This register reads back the over temperature status for the V1 and V2 regulators. It is used to turn V2 ON after a V2 over tem-

perature shutdown occurred in the Write mode.

OTV1: 1 = V1 over temperature shutdown, 0 = V1 no over temperature

OTV2: 1 = V2 over temperature shutdown, 0 = V2 no over temperature

OPWM1: 1 = V2 over temperature pre-warning, 0 = V2 normal temperature

OPWV2: 1 = V2 over temperature pre-warning, 0 = V2 normal temperature

In case of V1 or V2 over temperature, the appropriate voltage regulators are switched OFF automatically, and the over temperature

flags are set (latched). The flags can be reset by a Read operation of the register OTSR. Once V2 is switched OFF because of over

temperature (OTV2 = 1 ) it can only be switched ON again by forcing OTV2C = 0 by a Write operation.

The V1 and V2 pre-warning flags are set as long as the first over temperature exists. The flags disappear, when the temperature is

below the threshold. An over temperature of the V2 power supply will also switch OFF V3. After a power-ON reset, all bits of the reg-

ister are set to 0.

Table 35. Transceiver Error Status Register for CANH (TESRH)

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

TESRH

$014

R

TESRH3

TESRH2

TESRH1

TESRH0

W

RESET

—

—

—

—

0

0

0

0