BLUENRG-332VC datasheet(19/67 Pages) STMICROELECTRONICS

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2.16

True random number generator (RNG)

RNG is a random number generator based on a continuous analog noise that provides a 16-bit value to the host

when read. The minimum period is 1.25 us, corresponding to 20 RNG clock cycles between two consecutive

random number.

2.17

Timers and watchdog

The BlueNRG-LPS includes three general-purpose timers, one watchdog timer and a SysTick timer.

2.17.1

General-purpose timers (TIM2, TIM16, TIM17)

There are up to three general-purpose timers embedded in the BlueNRG-LPS.

Each general-purpose timer can be used to generate PWM outputs, or act as a simple time base.

•

TIM2

–

Full-featured general-purpose timer

–

Features four independent channels for input capture/output compare, PWM or one-pulse mode

output

–

Independent DMA request generation, support of quadrature encoders

•

TIM16 and TIM17

–

General-purpose timers with mid-range features:

–

16-bit auto-reload upcounters and 16-bit prescalers

–

1 channel and 1 complementary channel

–

All channels can be used for input capture/output compare, PWM or one-pulse mode output

–

The timers have independent DMA request generation

–

The timers are internally connected to generate an infrared interface (IRTIM) for remote control

2.17.2

Independent watchdog (IWDG)

The independent watchdog is based on a 12-bit downcounter and 8-bit prescaler. It is clocked from the LS clock

and it can operate in DEEPSTOP mode. It can also be used as a watchdog to reset the device when a problem

occurs.

2.17.3

SysTick timer

This timer is dedicated to real-time operating systems, but could also be used as a standard down counter. It

features:

•

A 24-bit down counter

•

Autoreload capability

•

Maskable system interrupt generation when the counter reaches 0

2.18

Real-time clock (RTC)

The RTC is an independent BCD timer/counter. The RTC provides a time of day/clock/calendar with

programmable alarm interrupt. RTC includes also a periodic programmable wake-up flag with interrupt capability.

The RTC provides an automatic wake-up to manage all low power modes.

Two 32-bit registers contain seconds, minutes, hours (12- or 24-hour format), day (day of week), date (day

of month), month, and year, expressed in binary coded decimal format (BCD). The sub-second value is also

available in binary format. Compensations for 28-, 29- (leap year), 30-, and 31-day months are performed

automatically. Daylight saving time compensation can also be performed. Additional 32-bit registers contain the

programmable alarm sub seconds, seconds, minutes, hours, day, and date.

A digital calibration circuit with 0.95 ppm resolution is available to compensate for quartz crystal inaccuracy. After

power-on reset, all RTC registers are protected against possible parasitic write accesses. As long as the supply

voltage remains in the operating range, the RTC never stops, regardless of the device status (RUN mode, low

power mode or under system reset). The RTC counter does not freeze when CPU is halted by a debugger.

BlueNRG-LPS

True random number generator (RNG)

DS13819 - Rev 4

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