C166: Access RTC in ST10-F269

Information in this article applies to:

• C166 All Versions

QUESTION

I need to access the RTC registers of the ST10F269 controller, but the compiler does not recognize these registers. I have tried to access these registers with the sfr keyword, but it does not help since it is an XBUS peripheral.

What is the correct way to access the RTC?

ANSWER

Define the XBUS peripherals as pointer constants as shown below:

#define RTCCON  (*((unsigned int volatile sdata *) 0xEC00))

Using this definition, you can access the RTCCON register as normal C variable.

SEE ALSO

• C166: RTC Interrupt Request Flag remains set in Simulator
• C166: Enabling XBUS Peripherals

Last Reviewed: Thursday, February 25, 2021