XCLKOUT problem using CONCERTO F23M35H52C1

mohammad elhagehassan

Hi,

I am using F23M35H52C1.

I am using the blinky example from the control suite.

I use this fucntion to modify the XCLKOUT divider but I see no effect.

SysCtlClockConfigSet(SYSCTL_USE_PLL | (SYSCTL_SPLLIMULT_M & 0xA) |

SYSCTL_SYSDIV_1 | SYSCTL_M3SSDIV_1 |
SYSCTL_XCLKDIV_4);

and I use SYSCTL_XCLKDIV_1 instead of SYSCTL_XCLKDIV_4.

Based on my readings, this should change the XCLKOUT.

Also do you think we can use XCLKOUT to provide a clk for external devices?

0 Brett Larimore over 12 years ago

Mohammad,

Which core is owning XCLKOUT GPIO? Note that only the Master M3 can control the XCLKOUT divider.

For more take a look at Figures 1-11 and 1-12 of the Concerto TRM. It may also be helpful to take a look at the following post (specifically Miro's question and Santosh's response):
http://e2e.ti.com/support/microcontrollers/tms320c2000_32-bit_real-time_mcus/f/171/p/194073/693316.aspx#693316

Thank you,
Brett

0 mike hage over 12 years ago in reply to Brett Larimore

Hi Brett,

Thank you for your reply. I found a useful post yesterday. So i guess if C28 core is controlling the xclkout then it will always be divided by 4.

It can only be divided down if it is controlled by the M3 core.

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