Datasheet

TJA1085 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 23 October 2012 32 of 61
NXP Semiconductors
TJA1085
FlexRay active star coupler
STATE_BRx:
Bits STATE_BRx indicate the current branch operating mode.
WU_BRx:
WU_BRx is set when a remote wake-up event is detected on a branch. A WU interrupt is
generated along with an EVENT_BRx interrupt to indicate the branch where the wake-up
pattern or dedicated data frame was detected.
WU_BRx is reset after the Branch Status register has been read successfully or when the
TJA1085 switches from AS_Normal to AS_Standby or AS_Sleep. This ensures that a new
wake-up event will be detected.
TxE_BRx:
TxE_BRx is set when a transmit error is detected on a branch, generating an
EVENT_BRx interrupt. A transmit error is detected when there is a mismatch between the
transmitted and received signals.
If bit latching is enabled (BIT_LATCHING = 1), TxE_BRx will remain set until the register
has been read, after which it is reset if no mismatch is found between transmitted and
received signals or the branch leaves Branch_Normal. If bit latching is not enabled,
TxE_BRx is reset if no mismatch is found in a data frame or the branch leaves
Branch_Normal.
CLAMP_BRx:
CLAMP_BRx is set when a branch is clamped for longer than t
detCL(bus)
, generating a
CLAMP_ERROR interrupt along with an EVENT_BRx interrupt to indicate the branch.
If bit latching is enabled (BIT_LATCHING = 1), CLAMP_BRx will remain set until the
register has been read, after which it is reset when idle is detected on the branch. If bit
latching is not enabled, CLAMP_BRx is reset when idle is detected on the branch.