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 22 of 61
NXP Semiconductors
TJA1085
FlexRay active star coupler
6.10.2.1 Control register
The read/write Control register allows the host controller to set the operating modes and
to switch the TJA1085 between HC and AP modes.
[1] The TJA1085 sets the APM flag at power-on, in response to a wake-up event (local, remote or TRXD), if a
V
CC
undervoltage is detected in AS_Normal or a V
IO
undervoltage is detected for longer than t
to(uvd)(VIO)
.
[2] Setting the RESET_ERROR bit resets all error status bits in the General Status (bits 8 to 1) and Branch
Status registers (bits 7 to 4).
Table 7. Control register bit description
Bit Symbol Access Default Description
11:10 OPM R/W 00 operating mode:
00: no change
01: AS_Standby
10: AS_Sleep
11: AS_Normal
9:8 CTRL_BR1 R/W 00 branch 1 control:
00: no change
01: Branch_Normal
10: Branch_TxOnly
11: Branch_Disabled
7:6 CTRL_BR2 R/W 00 branch 2 control:
00: no change
01: Branch_Normal
10: Branch_TxOnly
11: Branch_Disabled
5:4 CTRL_BR3 R/W 00 branch 3 control:
00: no change
01: Branch_Normal
10: Branch_TxOnly
11: Branch_Disabled
3:2 CTRL_BR4 R/W 00 branch 4 control:
00: no change
01: Branch_Normal
10: Branch_TxOnly
11: Branch_Disabled
1 APM
[1]
R/W 1 Autonomous Power mode
0: disabled
1: enabled
0 RESET_ERROR
[2]
R/W 0 reset error flags and status bits
0: no change
1: reset flags/bits