ST10F269ZX datasheet(110/184 Pages) STMICROELECTRONICS

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16 - REAL TIME CLOCK

ST10F269

110/184

16.1.5 - RTCAH & RTCAL: RTC ALARM Registers

When the programmable counters reach the 32-bit value stored into RTCAH & RTCAL registers, an alarm

is triggered and the interrupt request RTAIR is generated. Those registers are not protected.

RTCAL (EC12h)

XBUS

Reset Value: XXXXh

RTCAH (EC14h)

XBUS

Reset Value: XXXXh

Note: Those registers are not reset

16.2 - Programming the RTC

RTC interrupt request signals are connected to Port2, pad 10 (RTCSI) and pad 11 (RTCAI). An alternate

function Port2 is to generate fast interrupts firq[7:0]. To trigger firq[2] and firq[3] the following configuration

has to be set.

EXICON ESFR controls the external interrupt edge selection, RTC interrupt requests are rising edge

active.

EXICON (F1C0h)

ESFR

Reset Value: 0000h

Notes: 1. EXI2ES and EXI3ES must be configured as "01b" because RCT interrupt request lines are rising edge active.

2. Alarm interrupt request line (RTCAI) is linked with EXI3ES.

3. Timed interrupt request line (RTCSI) is linked with EXI2ES.

EXISEL ESFR enables the Port2 alternate sources. RTC interrupts are alternate sources 2 and 3.

EXISEL (F1DAh)

ESFR

Reset Value: 0000h

Notes: 1. Advised configuration.

2. Alarm interrupt request (RTCAI) is linked with EXI3SS.

3. Timed interrupt request (RTCSI) is linked with EXI2SS.

9876543210

RTCAL

9876543210

RTCAH

9876543210

EXI7ES

EXI6ES

EXI5ES

EXI4ES

EXI3ES 1 2

EXI2ES 1 3

EXI1ES

EXI0ES

9876543210

EXI7SS

EXI6SS

EXI5SS

EXI4SS

EXI3SS 2

EXI2SS 3

EXI1SS

EXI0SS

EXIxSS

External Interrupt x Source Selection (x=7...0)

‘00’: Input from associated Port 2 pin.

‘01’: Input from “alternate source”. 1

‘10’: Input from Port 2 pin ORed with “alternate source”. 1

‘11’: Input from Port 2 pin ANDed with “alternate source”.

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