M41T94 using SPI

[altanb]

Hello everyone,

I have the following problem using the M41T94 with my setup using a PIC18F8720. I have connected the SPI pins of the Real time clock to the HW SPI pins of the PIC. Also for the Chip Enable(/E) Pin of the RTC I used the A4 pin of the PIC. The setup of SPI is done using the following line:

setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_CLK_DIV_16);

I am trying to hold the A4 pin that is connected to Chip Enable high all the time as instructed by the datasheet yet the command output_high(PIN_A4)does not pull the pin high as I am seeing on the Oscilloscope.

Is there anything about the A4 pin that is peculiar that I should know about? Is my SPI setup correct?

Thanks

[Neutone]

Is that the pin with pull down only?

[altanb]

the datasheet says the following on that pin. I did not realize that before:

[Neutone]

Tie a pull up resistor from that pin to the voltage supply. You will be able to use it as if it were any other output.

[altanb]

Thanks,

worked like a charm