STM32L4P5CEU3P datasheet(53/311 Pages) STMICROELECTRONICS

53 / 311 page

DS12903 Rev 2

53/311

STM32L4P5xx

Functional overview

3.30

Random number generator (RNG)

All devices embed an RNG that delivers 32-bit random numbers generated by an integrated

analog circuit.

3.31

Parallel synchronous slave interface (PSSI)

The PSSI is a generic synchronous 8-/16-bit parallel data input/output slave interface. It

allows the transmitter to send a data valid signal to indicate when the data is valid, and the

receiver to output a flow control signal to indicate when it is ready to sample the data.

The PSSI main features are:

•

The PSSI shares most of the circuitry with the digital camera interface (DCMI). It thus

cannot be used simultaneously with the DCMI.

•

Slave mode operation

•

8- or 16-bit parallel data input or output

•

4-word (16-byte) FIFO

•

Data enable (DE) alternate function input and Ready (RDY) alternate function output.

When enabled, these signals can either allow the transmitter to indicate when the data

is valid or the receiver to indicate when it is ready to sample the data, or both.

3.32

HASH hardware accelerator (HASH)

The hash processor is a fully compliant implementation of the secure hash algorithm (SHA-

1, SHA-224, SHA-256), the MD5 (message-digest algorithm 5) hash algorithm and the

HMAC (keyed-hash message authentication code) algorithm suitable for a variety of

applications.

It computes a message digest (160 bits for the SHA-1 algorithm, 256 bits for the SHA-256

algorithm and 224 bits for the SHA-224 algorithm,128 bits for the MD5 algorithm) for

messages of up to (264 - 1) bits, while the HMAC algorithms provide a way of authenticating

messages by means of hash functions. The HMAC algorithms consist in calling the SHA-1,

SHA-224, SHA-256 or MD5 hash function twice.

3.33

Timers and watchdogs

The devices include two advanced control timers, up to nine general-purpose timers, two

basic timers, two low-power timers, two watchdog timers and a SysTick timer.

Table 10 below compares the features of the advanced control, general-purpose and basic

timers.

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