ATR0622 Datasheet, PDF (10/26 Pages) ATMEL Corporation – GPS Baseband Processor

3.3.2
3.3.3
Sensitivity Settings
Table 3-5. GPS Sensitivity Settings
GPSMODE3 GPSMODE2
(Fixed PU) (Reset = PU) Description
0
0
Auto mode
0
1
Fast mode
1
0
Normal mode (Default ROM value)
1
1
High sensitivity
Serial I/O Configuration
The ATR0622 features a two-stage I/O message and protocol selection procedure for the two
available serial ports. At the first stage, a certain protocol can be enabled or disabled for a
given USART port or the USB port. Selectable protocols are RTCM, NMEA and UBX. At the
second stage, messages can be enabled or disabled for each enabled protocol on each port.
In all configurations discussed below, all protocols are enabled on all ports. But output mes-
sages are enabled in a way that ports appear to communicate at only one protocol. However,
each port will accept any input message in any of the three implemented protocols
Table 3-6. Serial I/O Configuration
USART1/USB
USART2
GPSMODE12 GPSMODE6 GPSMODE5 (Output Protocol/ (Output Protocol/
(Reset = PU) (Reset = PU) (Reset = PD) Baud Rate (kBaud)) Baud Rate (kBaud)) Messages Information Messages
0
0
0
UBX/57.6
NMEA/19.2
High
User, Notice, Warning, Error
0
0
1
UBX/38.4
NMEA/9.6
Medium User, Notice, Warning, Error
0
1
0
UBX/19.2
NMEA/4.8
Low
User, Notice, Warning, Error
0
1
1
–/Auto
–/Auto
Off
None
1
0
0
NMEA/19.2
UBX/57.6
High
User, Notice, Warning, Error
1
0
1
NMEA/4.8
UBX/19.2
Low
User, Notice, Warning, Error
1
1
0
NMEA/9.6
UBX/38.4
Medium User, Notice, Warning, Error
1
1
1
UBX/115.2
NMEA/19.2
Debug
All
Both USART ports and the USB port accept input messages in all three supported protocols
(NMEA, RTCM and UBX) at the configured baud rate. Input messages of all three protocols
can be arbitrarily mixed. Response to a query input message will always use the same proto-
col as the query input message. The USB port does only accept NMEA and UBX as input
protocol by default. RTCM can be enabled via protocol messages on demand.
In Auto Mode, no output message is sent out by default, but all input messages are accepted
at any supported baud rate. Again, USB is restricted to only NMEA and UBX protocols.
Response to query input commands will be given the same protocol and baud rate as it was
used for the query command. Using the respective configuration commands, periodic output
messages can be enabled.
10 ATR0622 [Preliminary]
4891CS–GPS–01/06