ETAS
Hardware Description
BR_XETK-S4.0
-
User
Guide
25
• Minimum time interval 100
µs
• Maximum period duration 1
s
• Timer resolution 1
µs
The timers work in an asynchronous manner to the ECU.
4.9
Reset
The requirement for the BR_XETK-S4.0 reset mechanism is to ensure that
power-up and power-down behavior of ECU is clean and smooth. The BR_X
-
ETK-S4.0 normally drives /PORST low during XETK power up or upon INCA
request.
The signals /PORST and /ESR0 of the microcontroller are used by the BR_X
-
ETK-S4.0 to detect when the ECU is in reset.
The BR_XETK-S4.0 senses the switched ECU power supply. This allows it to
detect when the ECU is off and forward this information to INCA. In addition, it
allows the XETK to enter the power save mode with the calibration system
unplugged.