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how to interface both RTC DS1307 and SD CARD to PIC18f452

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abhignans

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Hello all,
im am trying to make a data logger to save temparature of 8 different places(i.e 8-channel)
i have selected pic 18f452 so tat i have lot many pins to interface multiple seven segment display(say 16)
i need to take the temparature inputs and display them on seven segment display and simultaniously save them to sd card with time recording of temp instance.

i have separately found the codes and worked on them separately for interfaing all the units
but i am using spi interface which needs the pins 17,18,23,24.i have attched the circuit here
2068804700_1366978494.png

and to interface rtc ds1307 this is the circuit diagram


now i have to connect them at a time and i am confused since these oth use same pins pin 23 and 16...how shud i interface them both at a time

im stuck at this point and not able to go ahead

please help me.

thanks.

abhi
 

tpetar

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