ATR0625P Datasheet, PDF (9/27 Pages) ATMEL Corporation – GPS Baseband Processor SuperSense

ATR0625P
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 ATR0625P 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)
GPSMODE1 (P9)
Enable configuration with GPSMODE pins
This pin (EXTINT0) is used for FixNow^™ functionality and not used for GPSMODE
configuration.
GPSMODE2 (P12)
GPS sensitivity settings
GPSMODE3 (P13)
GPSMODE4 (P14)
This pin (NAADET1) is used as active antenna supervisor input and not used for
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
In the case that GPSMODE pins with internal pull-up or pull-down resistors are connected to
GND/VDD18, additional current is drawn over these resistors. Especially GPSMODE3 can
impact the back-up current.
Enable GPSMODE Pin Configuration
Table 3-4. Enable Configuration with GPSMODE Pins
GPSMODE0
(Reset = PD) Description
0⁽¹⁾
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]
Note: 1. Leave open
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
4925G–GPS–06/08