ST10F296 datasheet(207/346 Pages) STMICROELECTRONICS

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ST10F296E

Real-time clock (RTC)

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RTC divider counter registers (RTCDH and RTCDL)

The divider counter registers (the basic reference clocks) include the RTC divider high

(RTCDH) and RTC divider low (RTCDL). These registers are read-only. They are reloaded

with the value stored in the prescaler registers, RTCPH and RTCPL. To get accurate time

measurements, the value of the divider can be read by reading the RTCDH and RTCDL.

When a bit is changed in the prescaler register, the value is loaded into the divider. When

the divider increments to reach 00000h, the 20-bit word stored in RTCPH or RTCPL is

loaded into it.

Note:

Bits 15 to 4 of the RTCDH are not used. When reading this register, the return value of these

bit is zero.

Note:

Neither the RTCDH nor the RTCDL counter registers can be reset.

Figure 74.

Divider counter registers

RTCDH (ED0Ch)

XBus

Reset value: ---Xh

987

65432

Reserved

RTCDH

-R

RTCDL (ED0Ah)

XBus

Reset value: XXXXh

987

65432

RTCDL

RTCDH

RTCDL

20-bit word internal value of the prescaler divider

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