SAA1575HL Datasheet, PDF (17/56 Pages) NXP Semiconductors – Global Positioning System GPS baseband processor

Philips Semiconductors
Global Positioning System (GPS)
baseband processor
Product specification
SAA1575HL
handbook, full pagewidth
RFDAT
RFCLK
RFLE
holding
control
X = don’t care.
XXXX
XXX1
XX10
XXXX
X100
1001
1001
MHB466
Fig.7 Example timing for UAA1570HL programming.
7.5.5 GENERAL PURPOSE I/O
The SAA1575HL possesses an 8-bit general purpose I/O register and 8 associated I/Os (see Fig.8). With the standard
Philips firmware, all 8 of these pins are configured as outputs.
With the standard Philips firmware, only pin GPIO0 is used. This is switched on at the end of the firmware initialization
sequence and remains on subsequently.
handbook, full pagewidth
1999 Jun 04
WRITE ENABLE
CFGn
DATA BUS
EN
DQ
IOn
CLK
READ ENABLE
VCC(P)
10 µA
pull-up
FET
GPIOn
pin
MHB467
Fig.8 GPIO pin drive circuits.
17