Posted on May 17, 2011 at 11:33 Hi Skywalker,
I recently measured these timings using my getting started program.
Sources are available from another discussion (see
http://www.stmcu.com/forums-cat-33-4.html
)
Notice that this example has a its startup file (see crtbegin.spp) slightly modified compared to the default one (the one delivered with the ST9+ toolschain).
These results (see below) were obtained with a 4MHz crystal and my code does not contain any initialized variable (RAM variable or direct register).
Startup time is then
Startup time =
~
~ 7.9ms + TestFlash
1. ST92F150, rev Y
TestFlash with SOUT high = 1.5ms
TestFlash with SOUT low = 8ms
so
Startup time with SOUT high = 9.4ms
Startup time with SOUT low = 7ms
2. ST92F250, rev A
TestFlash with SOUT high = 5ms
TestFlash with SOUT low = 7ms
so
Startup time with SOUT high = 4ms
Startup time with SOUT low = 6ms
3. ST92F120, rev Y
TestFlash with SOUT high = 1ms
TestFlash with SOUT low = 3ms
so
Startup time with SOUT high = 39ms
Startup time with SOUT low = 2ms
I hope this helps
Jojo
[ This message was edited by: jojo on 16-04-2003 20:32 ]
