ADC MCP3008 SPI Timing

[Kittu20]

I'm planning to interface a 10-bit ADC MCP3008 with my 8-bit PIC microcontroller. Before writing any code, I'm trying to understand the datasheet of the ADC. It appears that it only supports two SPI modes: CPOL=0, CPHA=0 (Figure 6.1) and CPOL=1, CPHA=1 (Figure 6.2) on pages 21 and 22. In the SPI protocol, data transfer or reception occurs on the clock edge.

In the case of CPOL=0, CPHA=0, I'm trying to determine in datasheet on which clock edge the microcontroller transfers data and on which clock edge the ADC receives data. Where can I find this information in the datasheet?

 

[KlausST]

Hi,

Page #4: "CLK Fall To Output Data Valid tDO"
--> tells: falling edge for data output

Also: page#5, Figure 1-1:
--> timing for Dout refer to falling clock edge

--> Timing for D_in (tsu, thd) refer to rising clock edge.

So both lines (Din, Dout) are
* updated at falling edge
* sampled at rising edge

Klaus