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CC3235MODAS: About FLASH_SPI_CLK on CC3235MODAS

Tao_2199
Genius 5660 points
Part Number: CC3235MODAS
Other Parts Discussed in Thread: UNIFLASH

Hello,

According to datasheet page 15, FLASH_SPI_CLK is input,

but according to datasheet page 34, FLASH_SPI_CLK is output.

Which is correct?

 

I think FLASH_SPI_CLK is output from specification.

 

Regards,

Tao_2199

  • 0
    Guru 73315 points

    Hi,

    Pin 15 of CC3235MOD package is a input in case of production programming of MOD. In runtime mode is this pin output. Because it is directly connected to pin of internal SPI flash.

    If you don't want to use gang programming during mass production (using 3rd party SPI flash prgroammer), you can left this pin NC.

    Jan

  • 0 in reply to Jan D
    Genius 5660 points

    Hello Jan,

     

    Thank you for comments.

    I have some question.

     

    > Because it is directly connected to pin of internal SPI flash.

     

    Does “internal SPI flash” mean 32-Mbit SPI Flash on CC3235MODx?

     

    >If you don't want to use gang programming during mass production (using 3rd party SPI flash programmer, you can left this pin NC.

    Does it mean that when 32-Mbit SPI Flash on CC3235MODx will be programmed with 3rd party SPI flash programmer, FLASH_SPI_CLK can be left as N.C.?

     

    Regards,

    Tao_2199

  • 0 in reply to Tao_2199
    Guru 73315 points

    Hi,

    Yes, CC3235MOD have inside 4MB SPI flash chip.

    There are two ways for production programming of CC3235MOD.

    • You can use UART with embedded programming or Uniflash CLI
    • You can use direct programming of internal SPI flash by 3rd party programmer. In this case you hold CC3235MOD at reset state and you connect all FLASH_SPI_* pins to 3rd party programmer. That means you will program internal SPI flash as any other SPI flash via pins MISO, MOSI, CS, CLK (FLASH_SPI_CLK  will be connected to programmer during production programming after programming will be NC).

    Jan