topic Re: MC56F84786 Continous Clock during data receive on SPI in Other NXP Products

MC56F84786 Continous Clock during data receive on SPI

20Sidar04 — Wed, 08 Nov 2023 15:36:45 GMT

Dear Mr. and Mrs.,

When i check results on Logic analyzer, SPI clock of MC56F84786 is not continous. I have attached results on message. When i worked with other brands microcontrollers, they have tranmit and receive functionality in one function. But When I checked Codewarriors IDE, it doesn’t Show any kind of function on Auto generated method section. Due to this reason, i implemented function like that by using seperate transmit and receive functions. As following PDF i send 0x92 and 3 byte 0x00. After sending each byte, I try to read response on SPI by using readbyte function. But during reading data, clock is not continous. When i check NXP community, some of microcontrollers family has continous clock for SPI. Is there solution for continous clock of MC56F84786. Thanks in advance for your precious supports.

Regards.

Sidar.

Re: MC56F84786 Continous Clock during data receive on SPI

xiangjun_rong — Thu, 09 Nov 2023 01:50:08 GMT

Hi,

The SPI timing is correct, based on SPI protocol, the SCK pin clock is NOT continuous. In detail, when the /CS is high, this is not data transfer process, the SCK clock disappears, when the /CS is low, this is the data transfer process, the SCK clock appears.

Hope it can help you

XiangJun Rong

Re: MC56F84786 Continous Clock during data receive on SPI

20Sidar04 — Thu, 09 Nov 2023 04:44:35 GMT

I mentioned about continous clock during Chip select low.

Re: MC56F84786 Continous Clock during data receive on SPI

20Sidar04 — Thu, 09 Nov 2023 05:12:43 GMT

For example, In the following SPI diagram, clock is continous during all the data transfer.

Re: MC56F84786 Continous Clock during data receive on SPI

xiangjun_rong — Thu, 09 Nov 2023 07:40:18 GMT

Hi,

The SPI of MC56F847xx is called queued spi instead of quad spi, the quadSPI interface can communicate with quad flash, but the queued spi of MC56F847xx is a normal spi, it has different timing from that of quad spi.

Hope it can help you

Xiangjun Rong

Re: MC56F84786 Continous Clock during data receive on SPI

20Sidar04 — Thu, 09 Nov 2023 07:46:58 GMT

But as following picture show SPI with CS,CLK, DATA input and Data output. In addition, I use normal SPI interface of Flash not Quad SPI interface.