TSS463B datasheet(30/59 Pages) ATMEL

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TSS463B

4102E–AUTO–12/04

ETIP: Enable Transmission In

Progress

The Transmission In Progress (TIP) tells the diagnosis system to enable transmission

diagnosis.

One: Enable TIP generation

Zero: Disable TIP generation.

ESDC: Enable System

Diagnosis Clock

The Synchronous Diagnosis Clock (SDC) controls the cycle time of the synchronous

diagnosis.

One: Enable SDC divider.

Zero: Disable SDC divider.

Command Register (0x03)

•

Write only register.

•

Reserved: Bit 1, 2. These bits must not be set by the user; a zero must always be

written to these bit.

•

If the circuit is operating at low bitrates, there might be a considerable delay

between the writing of this register and the performing of the actual command (worst

case 6 timeslots). The user is therefore recommended to verify, by reading the Line

Status Register (0x04), that the commands have been performed.

GRES: General Reset

The Reset circuit command bit performs, if set, exactly as if the external reset pin was

asserted. This command bit has its own auto-reset circuitry.

One: Reset active

Zero: Reset inactive

SLEEP: Sleep command

(Section “Sleep Command”, page 51). If the user sets the Sleep bit, the circuit will enter

sleep mode. When the circuit is in sleep mode, all non-user registers are setup to mini-

mize power consumption. Read/write accesses to the TSS463B via the SPI/SCI

interface are impossible, the oscillator is stopped.

To exit from this mode the user must apply either an hardware reset (external RESET

pin) either an asynchronous software reset (via the SPI/SCI interface).

One: Sleep active

Zero: Sleep inactive

IDLE: Idle command

(Section “Idle and Activate Commands”, page 51). If the user sets the Idle bit, the circuit

will enter idle mode. In idle mode the oscillator will operate, but the TSS463B will not

transmit or receive anything on the bus, and the TxD output will be in tri-state

One: Idle active

Zero: Idle inactive

ACTI: Activate command

(Section “Idle and Activate Commands”, page 51). The Activate command will put the

circuit in the active mode, i.e it will transmit and receive normally on the bus. When the

circuit is in activate mode the TxD tri-state output is enabled.

One: Activate active

Zero: Activate inactive

7654

3210

GRES

SLEEP

IDLE

ACTI

REAR

MSDC

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