Hey all,
I am doing a project on Vehicle Tracking System using GPS and GSM Modem.The 2 devices aforementioned communicates with 8051uC. But since there is only 1 UART in 8051 i have to use a analog multiplexer i.e CD 4062. I want to know how to interface it with GPS, GSM, and 8051.
Also it would be grateful if anyone could tell me how to parse output of GPS and how initialize a GPS receiver to that it starts giving me the GPRMC
I thought you said you were familiar with the 8051 architecture?!
XRAM, in the context of an 8051, is memory accessed by the MOVX instruction.
It was originally called 'X' for eXternal - because it was physically external to the 8051 chip.
Nowadays, most 8051-derivatives have at least some MOVX-addresses memory on-chip - so some people (including some chipmakers) fudge the issue by trying to give it different names.
As far as the CPU - and, therefore, your code - is concerned, it is all just MOVX-addressed memory; it is irrelevant whether it is physically on or off the chip.