ATR0622 Datasheet, PDF (9/26 Pages) ATMEL Corporation – GPS Baseband Processor

ATR0622 [Preliminary]
3.3 Setting GPSMODE0 to GPSMODE12
The start-up configuration of a ROM-based system without external non-volatile memory is
defined by the status of the GPSMODE pins after system reset. Alternatively, the system can
be configured through message commands passed through the serial interface after start-up.
This configuration of the ATR0622 can be stored in an external non-volatile memory like
EEPROM. Default designates settings used by ROM firmware if GPSMODE configuration is
disabled (GPSMODE0 = 0).
3.3.1
Table 3-3. GPSMODE Functions
Pin
Function
GPSMODE0 (P1) Enable configuration with GPSMODE pins
GPSMODE1 (P9)
This pin (EXTINT0) is used for FixNow functionality and not used for GPSMODE
configuration.
GPSMODE2 (P12)
GPS sensitivity settings
GPSMODE3 (P13)
This pin (NAADET1) is used as active antenna supervisor input and not used for
GPSMODE4 (P14) GPSMODE configuration. This is the default selection if GPSMODE configuration
is disabled.
GPSMODE5 (P17)
Serial I/O configuration
GPSMODE6 (P19)
GPSMODE7 (P23) USB Power Mode
GPSMODE8 (P24) General I/O Configuration
GPSMODE9 (P25)
This pin (NAADET0) is used as active antenna supervisor input and not used for
GPSMODE configuration.
GPSMODE10 (P26)
General I/O Configuration
GPSMODE11 (P27)
GPSMODE12 (P29) Serial I/O configuration
Enable GPSMODE Pin Configuration
Table 3-4. Enable Configuration with GPSMODE Pins
GPSMODE0
(Reset = PD) Description
0
Ignore all GPSMODE pins. The default settings as indicated below are used.
1
Use settings as specified with GPSMODE[2, 3, 5 to 8, 10 to 12]
If the GPSMODE configuration is enabled (GPSMODE0 = 1) and the other GPSMODE pins
are not connected externally, the reset default values of the internal pull-down and pull-up
resistors will be used.
9
4891CS–GPS–01/06