TL16CP754CIPM Register Description

Hi All,

For example the MCR register describes that if we wwrite MCR[1] = 0 Forces /RTS to inactive or a logical state equals to High.

But our observation is after writing MCR[1] = 1 /RTS signal goes high.

Similarly ot make RTS low we have to write MCR[1] = 0.

Is this expected or else we are doing some thing wrong. Please help us in understanding this

Regards,

GSR

Hello GSR,

I will look at this on the bench and verify the functionality. I will get a response to you later today.

Best Regards,

Joe

Hi  GSR,

Attached are two scope captures from a Tek MSO4104 scope. One is /RTS and /DTS when writing a 0x07 to the MCR register (BASE +  04) and the other shows /RST and /DTS when writing a 0x00 to the MCR. /RTS and /DTS are labeled in the captures. Bus B1 is the data bus and Bus B2 is the address bus.

Please let me know if you have any questions.

For some reason I can only attache one picture to this message. I'll post the capture then send another reply with the second capture.

Thank you.

Best Regards,

Joe

GSR,

here is the other capture, writing 0x00 to the MCR

Hi Joe Fockler.

Thank You so much for your time.

Sorry, I didn't notice that there is a Transceiver between TL16C754C and the connector which connects to the PC.

When we probe at TL16C754C now we do observe the same what you are observing.

Regards,

GSR

Hi Joe,

I haven't tested yet. I will let you know the results after testing.

Regards,

GSR

Hi Joe,

We are facing one issue w.r.t. Tx. When we transmit we are observing some junk junk characters.

I have printed the data in the buffer that is passed by Application to Driver and observed that data is correct.

For example when we transferred 192 bytes data, the following data is observed on Tera Term with following settings 115200-Baud, 8-Data Bits, No Parity, 1=Stop Bit and no Flow control

W

   ?ÍѹL]???Íѹ?]???Íѹ?]???Íѹ?]???ÍѹÕÿ Write test. F 6 Write test. F 7 Write test. F 8 Write test. F 9 Write test. F 0 Write test. F 1 Write test. F 0 Write test. F 1 Write test. F 2 Write test. F 3 Write test. F 4 Write test. F 5 Write test

We are writing to THR register in CPU mode. The code for it pasted below

while(u32BytesToSent)

{

do

if((u8LSR & 0x20) == 0x20)

break;

}

while(1);

//while((u8LSR & UART_LSR_THR_EMPTY) == FALSE);

Hi All,

Thanks for your time. We are able to identify the problem. RS-232 Transceiver is the culprit.

Regards,

GSR