I remember that I read somewhere, that you need a PU anyway, even if you do not use it for I2C. This implies that the output is always kind of 'open-drain'. For input only application it depends on the external driver. However adding a resistor that can be omitted if not necessary is not a 'big deal' ... Markus Leighton Rowe schrieb: > How necessary is it for me to use pullups while implementing P0.3 as EINT1? > > Markus Meng <meng.engineering@...> wrote:Hi, > > I2C normally needs pullup's regardless of the implementation ... > > Markus > > nevelian schrieb: > >>Hi, >> >>I want to use P0.2 (SCL) & P0.3 (SDA) as GPIO, and are using the >>following code; >> >> PINSEL0 = 0x00000005; >> PINSEL1 = 0; >> IODIR = 0xFFFFFFFF; >> IOSET = 0xFFFFFFFF; >> >>According to the datasheet I should have setup P0.0 & P0.1 as Uart >>pins and the rest as GPIO. >> >>The UART works, as do GPIO P0.4 - P0.31, but why aren't P0.2 & P0.3 >>outputing high (or do they need pullups)? >> >>Rob >> >> >> >> >> >> >> >>Yahoo! Groups Links >> >> >> >> >> >> >> >> > > -- Mit freundlichen Gr\ufffdssen Markus Meng ************************************************************************ ** Meng Engineering Telefon 056 222 44 10 ** ** Markus Meng Natel 079 230 93 86 ** ** Bruggerstr. 21 Telefax 056 222 44 34 ** ** CH-5400 Baden Email markus.meng@... ** ** Web www.meng-engineering.ch ** ************************************************************************ ** You cannot create experience. You must undergo it. Albert Camus **
Message
Re: [lpc2000] P0.2 & P0.3 problems
2004-12-19 by Markus Meng