16

4890AS–GPS–09/05

ATR0621 [Preliminary]

P19/SIGLO2/GPSMODE6

Pull-up resistor to VDD18 or pull-down resistor to GND if used as input by user application; connect to

GND or VDD18 if unused or used as GPSMODE pin only. See GPSMODE definitions in “Setting

GPSMODE0 to GPSMODE12” on page 10. Can be left open if not used as GPSMODE pin and

configured as output by user application.

P20/SCK2/TIMEPULSE

Output in default ROM firmware: leave open; only needs pull-up resistor to VDD18 or pull-down resistor

to GND if used as GPIO input by user application and not always driven from external sources.

P21/TXD2

Output in default ROM firmware: leave open; only needs pull-up resistor to VDD18 or pull-down resistor

to GND if used as GPIO input by user application and not always driven from external sources.

P22/RXD2

Pull-up resistor to VDD18 or connect to VDD18 if unused. Pull-down resistor also possible if used as

GPIO input by user application. Never leave open.

P23/SCK/GPSMODE7

Pull-up resistor to VDD18 or pull-down resistor to GND if used as input by user application; connect to

GND or VDD18 if unused or used as GPSMODE pin only. See GPSMODE definitions in “Setting

GPSMODE0 to GPSMODE12” on page 10. Can be left open if not used as GPSMODE pin and

configured as output by user application.

P24/MOSI/GPSMODE8

Pull-up resistor to VDD18 or pull-down resistor to GND if used as input by user application; connect to

GND or VDD18 if unused or used as GPSMODE pin only. See GPSMODE definitions in “Setting

GPSMODE0 to GPSMODE12” on page 10. Can be left open if not used as GPSMODE pin and

configured as output by user application.

P25/MISO/GPSMODE9

Pull-up resistor to VDD18 or pull-down resistor to GND if used as input by user application; connect to

GND or VDD18 if unused or used as GPSMODE pin only. See GPSMODE definitions in “Setting

GPSMODE0 to GPSMODE12” on page 10. Can be left open if not used as GPSMODE pin and

configured as output by user application.

P26/NSS/NPCS0/

GPSMODE10

Pull-up resistor to VDD18 or pull-down resistor to GND if used as input by user application; connect to

GND or VDD18 if unused or used as GPSMODE pin only. See GPSMODE definitions in “Setting

GPSMODE0 to GPSMODE12” on page 10. Use pull-up resistor to VDD18, if SPI is used. Never leave

open.

P27/NPCS1/GPSMODE11

Pull-up resistor to VDD18 or pull-down resistor to GND if used as input by user application; connect to

GND or VDD18 if unused or used as GPSMODE pin only. See GPSMODE definitions in “Setting

GPSMODE0 to GPSMODE12” on page 10. Can be left open if not used as GPSMODE pin and

configured as output by user application.

P28/EM_A20/NPCS2

Output in default ROM firmware: leave open; only needs pull-up resistor to VDD18 or pull-down resistor

to GND if used as GPIO input by user application and not always driven from external sources.

P29/NPCS3/GPSMODE12

Pull-up resistor to VDD18 or pull-down resistor to GND if used as input by user application; connect to

GND or VDD18 if unused or used as GPSMODE pin only. See GPSMODE definitions in “Setting

GPSMODE0 to GPSMODE12” on page 10. Can be left open if not used as GPSMODE pin and

configured as output by user application.

P30/AGCOUT0

Internal pull-up resistor, leave open.

P31/RXD1

Pull-up resistor to VDD18 or connect to VDD18 if unused. Pull-down resistor also possible if used as

GPIO input by user application. Never leave open.

EM_DA0 to EM_DA15

If no external memory is used, can be left open (internal pull-down). If an external memory is connected

to these pins, a defined level is needed when all external memories are inactive.

Table 3-15.

Recommended Pin Connection (Continued)

Pin Name

Recommended External Circuit

Note:

“Never leave open” means: This pin needs a defined level, even if VDD18 is not supplied and system is in backup mode.