ST10F296 datasheet(208/346 Pages) STMICROELECTRONICS

208 / 346 page

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Real-time clock (RTC)

ST10F296E

208/346

RTC programmable counter registers (RTCH and RTCL)

The RTC has two x 16-bit programmable counters which are controlled by two counter

registers: The RTC counter high register (RTCH) and the RTC counter low register (RTCL).

The count rate of the counters is based on a basic time reference (for example, 1 s). As the

clock oscillator may be kept working, even in power-down mode, the RTC counters may be

used as a system clock. In addition, RTC counters and registers are not modified at a

system reset. The only way to force their value is to write them via the XBus.

The RTC counter registers are write protected. The RTCOFF bit of the RTCCON register

(see Table 124) must be set (RTC dividers and counters are stopped) to enable a write

operation on RTCH or RTCL.

A write operation on RTCH or RTCL register loads the corresponding counter directly. When

reading, the current value in the counter (system date) is returned.

The counters keep running while the clock oscillator is working.

Note:

Neither the RTCL nor the RTCH registers can be reset.

RTC alarm registers (RTCAH and RTCAL)

The RTC alarm registers include the RTC alarm high (RTCAH) and RTC alarm low

(RTCAL). When the counters reach the 32-bit value stored in the RTCAH and RTCAL

registers, an alarm is triggered and the interrupt request, RTAIR, is generated. These

registers are not protected.

Note:

Neither the RTCAL nor the RTCAH registers can be reset.

RTCH (ED10h)

XBus

Reset value: XXXXh

987

65432

RTCH

R/W

RTCL (ED0Eh)

XBus

Reset value: XXXXh

987

65432

RTCL

R/W

RTCAH (ED14h)

XBus

Reset value: XXXXh

987

65432

RTCAH

R/W

RTCAL (ED12h)

XBus

Reset value: XXXXh

987

65432

RTCAL

R/W

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