September 2013

DocID007016 Rev 2

1/11

AN1216

Application note

and serial real-time clocks (RTCs)

Introduction

be set either for a given time and day, or to repeat at a certain day in every month, or at a

certain hour in every day, or at a certain minute of every hour, or at a certain second of every

minute. With this functionality already provided in the hardware, the software to implement

an alarm of any given period is greatly simplified, as described in this document.

Although specifically tailored for the M48T37V/Y device, applications can be easily adapted

to use any of ST’s other TIMEKEEPER or serial RTC devices that have the alarm feature.

Some modifications in the MCU memory mapping (the TIMEKEEPER or RTC address

space) and in the MCU register mapping (such as the pointer to register address) would

need to be made.

TIMEKEEPER

M48T37V/Y, M48T201V/Y

Serial RTC

M41T62, M41T63, M41T64, M41T65, M41T66, M41T80, M41T81, M41T81S,

M41T82, M41T83, M41T93, M41T94, M41ST85W, M41ST87W

www.st.com