STCOM datasheet(11/58 Pages) STMICROELECTRONICS

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STCOM

Description

1.3.2

Floating point unit (FPU)

The FPU fully supports single precision add, subtract, multiply, divide, multiply and

accumulate, and square root operations. It also provides conversions between the fixed

point and floating point data formats, and floating point constant instructions.

The FPU provides floating point operations that are compliant with the NSI/IEEE Std 754-

2008 A, IEEE Standard for Binary Floating-point Arithmetic©, referred to as the IEEE 754

Standard.

The FPU contains 32 single precision extension registers, which can also be accessible as

16 double word registers for load, store, and move operations.

1.3.3

Nested vectored interrupt controller (NVIC)

The STCOM embeds a NVIC able to handle 80 maskable interrupts. The software priority

level is configurable in the range of 0 - 31 for each interrupt. A higher level corresponds to

a lower priority, so the level 0 is the highest interrupt priority. In case two or more interrupt

lines share the same software priority level, the hardware priority level, which is described in

Table 2, is used.

Table 1. Cortex™-M4F core configuration

Component

Presence

Comment

JTAG

Yes

Full-featured debug access port (DAP), SWJ-DP and AHB access port

ETM

Yes

Embedded Trace Macrocell present

ITM

Yes

Instrumentation Trace Macrocell

TPIU

Yes

Trace port unit interface present

FPB

Yes

Flash patch breakpoint

DWT

Yes

Data watchpoint and trace

DEBUG level

N/A

Full debug with data matching for watchpoint generation

IRQ

N/A

80 IRQ source

Priority level

N/A

Set to 5:32 levels

MPU

Yes

Memory protection unit present. 8 regions implemented

FPU

Yes

Floating point unit present (single precision)

Yes

Bit banding region present

RESET_ALL_REGS

Yes

Reset all synchronous state

CLKGATE

Yes

Possibility to minimize dynamic power dissipation by clock gating

WIC

Yes

10 lines: NMI, WWDG, RTC, GPIOs, IPC, DMA, GPT0, SPI0 and USART0

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