ST10F269ZX datasheet(106/184 Pages) STMICROELECTRONICS

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16 - REAL TIME CLOCK

ST10F269

106/184

16.1 - RTC registers

16.1.1 - RTCCON: RTC Control Register

The functions of the RTC are controlled by the

RTCCON control register. If the RTOFF bit is set,

the RTC dividers and counters clock is disabled

and registers can be written, when the ST10 chip

enters power down mode the clock oscillator will

be switch off. The RTC has 2 interrupt sources,

one is triggered every basic clock period, the

other one is the alarm.

RTCCON includes an interrupt request flag and

an interrupt enable bit for each of them. This

RTCCON (EC00h)

XBUS

Reset Value: --00h

Notes: 1. As RTCCON register is not bit-addressable, the value of these bits must be read by checking their associated CCxIC register.

The 2 RTC interrupt signals are connected to Port2 in order to trigger an external interrupt that wake up the chip when in power down

Figure 51 : RTC Block Diagram

/64

RTCPL

RTCPH

RTCH

RTCL

RTCDH

RTCDL

RTCAH

RTCAL

Clock Oscillator

Reload

20 bit DIVIDER

32 bit COUNTER

RTCCON

AlarmIT

Basic Clock IT

RTCAI RTCSI

Programmable ALARM Register

Programmable PRESCALER Register

RTCOFF

RTCAEN RTCAIR RTCSEN RTCSIR

RTCOFF 2

RTC Switch Off Bit

‘0’: clock oscillator and RTC keep on running even if ST10 in power down mode

‘1’: clock oscillator is switch off if ST10 enters power down mode, RTC dividers and

counters are stopped and registers can be written

RTCAEN 2

RTC Alarm Interrupt ENable

‘0’: RTCAI is disabled

‘1’: RTCAI is enabled, it is generated every n seconds

RTCAIR 1

RTC Alarm Interrupt Request flag (when the alarm is triggered)

‘0’: the bit was reseted less than a n seconds ago

‘1’: the interrupt was triggered

RTCSEN 2

RTC Second interrupt ENable

‘0’: RTCSI is disabled

‘1’: RTCSI is enabled, it is generated every second

RTCSIR 1

RTC Second Interrupt Request flag (every second)

‘0’: the bit was reseted less than a second ago

‘1’: the interrupt was triggered

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