Cinterion
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ELS31-VA/ELS51-VA Hardware Interface Description
2.1 Application Interface
56
ELS31-VA_ELS51-VA_HID_v01.000
2017-01-04
Confidential / Preliminary
Page 26 of 106
2.1.4.1
Serial Interface Start-up Behavior
The following figure shows the startup behavior of the asynchronous serial interface ASC0.
For pull-up and pull-down values see
Figure 7:
ASC0 startup behavior
No data must be sent over the ASC0 interface before the interface is active and ready to re-
ceive data (see
TXD0
RXD0
RTS0
CTS0
DTR0
DSR0
DCD0
RING0
ON
EMERG_RST
Power supply active
Start up
Firmware
initialization
Command interface
initialization
Interface
active
V180
VCORE
Reset
state