Keil forum SBUF = mychar; TI = 0; // is there a preferred sequence?

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SBUF = mychar; TI = 0; // is there a preferred sequence?

Douglas Hewett over 21 years ago

Is there a preferred sequence?

SBUF = mychar;
TI   = 0;

// or

TI   = 0;
SBUF = mychar;

0 Jon Ward over 21 years ago
I'd use

TI = 0; SBUF = mychar;

Because if serial I/O is REALLY fast or if you get an interrupt between these two statements:

SBUF = mychar; TI = 0;

clearing TI would be bad.

Jon
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0 V K over 21 years ago

I prefer

if (_testbit_ (TI)) SBUF = mychar; and
if (_testbit_ (RI)) mychar = SBUF;

The _testbit_ routine produces a JBC instruction in the generated program code to simultaneously test the bit b and clear it to 0.
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