GPS140 Datasheet, PDF (26/38 Pages) List of Unclassifed Manufacturers – GPS Positioning Module

Chapter 5 BOARD OPERATION AND PROGRAMMING
This chapter shows you how to program and use your GPS140HR. It provides a
general description of the I/O map. Detailed serial port programming tips are not
within the scope of this manual.
Defining the Memory Map
The memory map of the GPS140HR occupies eight bytes of host PC I/O space. This
window is freely selectable by the user as described in Chapter 2, Table 2-2. After
setting the base address you have access to the internal resources of the GPS140HR
control logic. These resources are not described in detail, since they are mapped as a
standard PC serial port. For more details on the EXAR ST16C550IJ44 UART chip
programming please download the component specific data sheet from the
manufacturers website: http://www.exar.com/products/st16c550.html
ADDR
REGISTER
DIR
BASE
TXD
O
RXD
I
BAUD div. low
BASE+1 BAUD div. high
BASE+2
IRQ enable
IRQ ID
BASE+3
BASE+4
BASE+5
BASE+6
Line control
Modem control
Line status
Modem status
COMMENTS
Only if control reg. Bit 7=0
Only if control reg. Bit 7=0
Only if control reg. Bit 7=1
Only if control reg. Bit 7=1
Only if control reg. Bit 7=0
Table 5-1 General I/O map of the GPS140HR
BASE = Base Address
GPS140HR
26
RTD Embedded Technologies, Inc.