ST92F120/F150/F250 startup time (TestFlash, crtbegin etc.)

[johanpauvert2]

Posted on April 16, 2003 at 17:00

ST92F120/F150/F250 startup time (TestFlash, crtbegin etc.)

[johanpauvert2]

Posted on May 17, 2011 at 11:33

What is the ST92F120/F150/F250 startup time after an external reset ?

Skywalker

[johan239955_stm1_stmicro]

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 ]