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Einly
Joined: 10 Sep 2003
Posts: 60
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| output_float vs set_tris_c() ? |
 Posted: Wed Aug 25, 2004 8:23 am |
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Dear all,
Referring to the file write & read external eeprom, there are 2 lines:
output_float(eeprom_sda);
output_float(eeprom_scl);
In the ccs manual, it is stated that output_float is used to:
Sets the specified pin to the input mode. This will allow the pin to float high to represent a high on an open collector type of connection.
May I know what is meant by the second sentence <This will allow...> ?
To make a pin high, why can't we use set_tris_b(...)?
Is there any difference between the 2?
Thanks a lot
_________________
Einly |
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Ttelmah
Guest
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| Re: output_float vs set_tris_c() ? |
| Posted: Wed Aug 25, 2004 9:12 am |
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| Einly wrote: | Dear all,
Referring to the file write & read external eeprom, there are 2 lines:
output_float(eeprom_sda);
output_float(eeprom_scl);
In the ccs manual, it is stated that output_float is used to:
Sets the specified pin to the input mode. This will allow the pin to float high to represent a high on an open collector type of connection.
May I know what is meant by the second sentence <This will allow...> ?
To make a pin high, why can't we use set_tris_b(...)?
Is there any difference between the 2?
Thanks a lot |
The 'key' difference, is that the output_float instruction deals with a single pin. Effectively it is equivalent to reading the TRIS register, setting the single bit for the designated pin, and writing this back to the register.
Best Wishes |
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