AN3133 datasheet(24/43 Pages) STMICROELECTRONICS

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Useful RTC configuration examples

AN3133

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Doc ID 16956 Rev 5

3.4.3

Periodic timebase/wakeup clock configuration 3

For this configuration, the resolution is the same as for configuration 2. However the

timebase/wakeup counter downcounts starting from 0x1FFFF to 0x00000, instead of

0xFFFF to 0x0000 for configuration 2.

●

For medium-density products

–

The minimum timebase/wakeup period is:

(0x10000 + 1) x 125 ns = 8.19 ms

–

The maximum timebase/wakeup period is:

(0x1FFFF+ 1) x 2048 s = more than 8 years

●

For medium+ and high-density products

–

The minimum timebase/wakeup period is:

(0x10000 + 1) x 62.5 ns = 4.09 ms

–

The maximum timebase/wakeup period is:

(0x1FFFF+ 1) x 8192 s = more than 33 years

3.4.4

Summary of timebase/wakeup period extrema

The minimum and maximum period values, according on the configuration, are listed in

Table 14 for medium density products and Table 15 for medium+ and high-density products.

Table 14.

Min. and max. timebase/wakeup period (medium density products)

Configuration

Minimum period

Maximum period

250 ns

2048 s

125 ns

More than 4 years

8.192125 ms

More than 8 years

Table 15.

Min. and max. timebase/wakeup period (med+ and high-density products)

Configuration

Minimum period

Maximum period

0.250 µs

2048 s

62.5 ns

More than 16 years

4.096 ms

More than 33 years

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