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I'm trying to use the MCLR pin for I/O on this device. The data sheet claims to do so you clear the MCLRE config bit. When I do this the device behaves very oddly (output pins go to Vdd) and it almost looks like a reset that only half happened but not exactly. I'm using INTOSC (with no clock out). Also, no BOD, no WDT, no LVP set. There is a somewhat cryptic footnote in the datasheet section on the MCLRE config bit that says "When MCLR is asserted in INTOSC or RC mode, the internal clock oscillator is disabled." Are they trying to say that you can't use INTOSC and turn MCLR into a GPIO pin at the same time? If so, I'm kinda pissed as that leaves me with 5 pins, not 6. Anyone ever got INTOSC and MCLRE=0 to work at the same time? Given that it costs $1, I plan on using it a bunch so I guess I cant be too mad ... Phil |
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12F675/629 question
Started by ●March 29, 2004
Reply by ●March 29, 20042004-03-29
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--- In , "Phil" <phil1960us@y...> wrote: > I'm trying to use the MCLR pin for I/O on this device. The data > sheet claims to do so you clear the MCLRE config bit. When I do > this the device behaves very oddly (output pins go to Vdd) and it > almost looks like a reset that only half happened but not exactly. > I'm using INTOSC (with no clock out). Also, no BOD, no WDT, no LVP > set. > > There is a somewhat cryptic footnote in the datasheet section on the > MCLRE config bit that says "When MCLR is asserted in INTOSC or RC > mode, the internal clock oscillator is disabled." Are they trying to > say that you can't use INTOSC and turn MCLR into a GPIO pin at the > same time? If so, I'm kinda pissed as that leaves me with 5 pins, > not 6. > > Anyone ever got INTOSC and MCLRE=0 to work at the same time? > > Given that it costs $1, I plan on using it a bunch so I guess I cant > be too mad ... > > Phil Phil, I have used the 12F629 with INTOSC and internal MCLR on several occasions without incident. I haven't read that statement in the manual but I could have an older version of the manual. Mike |
Reply by ●March 29, 20042004-03-29
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I've used MCLR as I/O w/ the intosc on 12F629's and 675's.
Didn't use the internal pullups or analog on any I/O. --- Phil <> wrote: > I'm trying to use the MCLR pin for I/O on this device. The data > sheet claims to do so you clear the MCLRE config bit. When I do > this the device behaves very oddly (output pins go to Vdd) and it > almost looks like a reset that only half happened but not exactly. > I'm using INTOSC (with no clock out). Also, no BOD, no WDT, no LVP > set. > > There is a somewhat cryptic footnote in the datasheet section on the > MCLRE config bit that says "When MCLR is asserted in INTOSC or RC > mode, the internal clock oscillator is disabled." Are they trying to > > say that you can't use INTOSC and turn MCLR into a GPIO pin at the > same time? If so, I'm kinda pissed as that leaves me with 5 pins, > not 6. > > Anyone ever got INTOSC and MCLRE=0 to work at the same time? > > Given that it costs $1, I plan on using it a bunch so I guess I cant > be too mad ... > > Phil __________________________________ |
