
1999 Jun 04
6
Philips Semiconductors
Product specication
Global Positioning System (GPS)
baseband processor
SAA1575HL
6
PINNING
SYMBOL
PIN
I/O
DESCRIPTION
SCLK
1
O
Sample clock: sample clock generated internally by dividing down the RCLK
(reference clock) input. This output is provided for use by the front-end IC.
T1S
2
O
GPS time pulse: a 1 pulse per second output whose rising or falling edge (rmware
controlled) is synchronized to GPS time when the receiver is tracking a GPS signal.
The pulse length is approximately 1 ms.
TP3
3
I
Test pin: tie HIGH
TP4
4
I
Test pin: tie HIGH
GPIO5
5
I/O
GPIO bit 5: standard general purpose I/O mapped into the segment 15 of the address
space. The top 4 bits can be used as the XA external timer control access pins
(T0, T1, T2 and T2EX).
GPIO6
6
I/O
GPIO bit 6: standard general purpose I/O mapped into the segment 15 of the address
space. The top 4 bits can be used as the XA external timer control access pins
(T0, T1, T2 and T2EX).
GPIO7
7
I/O
GPIO bit 7: standard general purpose I/O mapped into the segment 15 of the address
space. The top 4 bits can be used as the XA external timer control access pins
(T0, T1, T2 and T2EX).
n.c.
8
O
Not connected: do not connect
n.c.
9
O
Not connected: do not connect
A19
10
O
External memory address bus bit 19: 19-bit address bus; used to address external
RAM and program memory
A18
11
O
External memory address bus bit 18: 19-bit address bus; used to address external
RAM and program memory
VCC(core)
12
Main core power supply: 2.7 to 3.6 V only; main supply for the core in normal
operation
VSS
13
Ground: 0 V reference
XTAL1
14
I
Crystal 1: input to the inverting amplier; used in the system oscillator circuit and
input to the internal clock generator circuits
XTAL2
15
O
Crystal 2: output from the system oscillator amplier
VCC(P)
16
Main I/O power supply: 2.7 to 5.5 V operating range; main supply for the periphery
in normal operation
VSS
17
Ground: 0 V reference
A17
18
O
External memory address bus bit 17: 19-bit address bus; used to address external
RAM and program memory
A16
19
O
External memory address bus bit 16: 19-bit address bus; used to address external
RAM and program memory
A15
20
O
External memory address bus bit 15: 19-bit address bus; used to address external
RAM and program memory
A14
21
O
External memory address bus bit 14: 19-bit address bus; used to address external
RAM and program memory
A13
22
O
External memory address bus bit 13: 19-bit address bus; used to address external
RAM and program memory
A12
23
O
External memory address bus bit 12: 19-bit address bus; used to address external
RAM and program memory