saa1575hl NXP Semiconductors, saa1575hl Datasheet - Page 17

• Manufacturer Part Number: saa1575hl
• Description: Global Positioning System Gps Baseband Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.5.5
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.
1999 Jun 04
handbook, full pagewidth
handbook, full pagewidth
Global Positioning System (GPS)
baseband processor
X = don’t care.
G
ENERAL PURPOSE
RFDAT
RFCLK
RFLE
holding
control
I/O
XXXX
Fig.7 Example timing for UAA1570HL programming.
DATA BUS
WRITE ENABLE
Fig.8 GPIO pin drive circuits.
READ ENABLE
XXX1
D
CLK
EN
IOn
Q
CFGn
XXXX
17
XX10
pull-up
FET
X100
V CC(P)
MHB467
10 A
GPIOn
pin
1001
SAA1575HL
Product specification
1001
MHB466