atr0621 ATMEL Corporation, atr0621 Datasheet - Page 10

• Manufacturer Part Number: atr0621
• Description: Gps Baseband Processor - Atmel Corporation
• Manufacturer: ATMEL Corporation

3.3
3.3.1
3.3.2
10
Setting GPSMODE0 to GPSMODE12
ATR0621 [Preliminary]
Enable GPSMODE Pin Configuration
Sensitivity Settings
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.
If Flash memory is available, configuration data can be stored in Flash memory. If EEPROM
memory is connected, configuration data can be stored in EEPROM. Default designates set-
tings used by ROM firmware if GPSMODE configuration is disabled (GPSMODE0 =0).
Table 3-3.
Table 3-4.
Table 3-5.
Pin
GPSMODE0
GPSMODE1
GPSMODE2
GPSMODE3
GPSMODE4
GPSMODE5
GPSMODE6
GPSMODE7
GPSMODE8
GPSMODE9
GPSMODE10
GPSMODE11
GPSMODE12
(Reset = PD) Description
GPSMODE3
GPSMODE0
(Fixed PU)
0
1
0
0
1
1
GPSMODE Functions
Enable Configuration with GPSMODE Pins
GPS Sensitivity Settings
Ignore all GPSMODE pins. The default settings as indicated below are used
Use settings as specified with GPSMODE[2, 3, 5 to 8, 10 to12]
(Reset = PU) Description
GPSMODE2
Function
Enable configuration with GPSMODE pins
This pin is used for FixNow functionality and not used for GPSMODE configuration
GPS sensitivity settings
This pin (NAADET1) is used as active antenna supervisor input and not used for
GPSMODE configuration
Serial I/O configuration
USB Power Mode
General I/O Configuration
This pin (NAADET0) is used as active antenna supervisor input and not used for
GPSMODE configuration
General I/O Configuration
Serial I/O configuration
0
1
0
1
Auto mode
Fast mode
Normal mode (Default)
High sensitivity
4890AS–GPS–09/05