STR720 datasheet(138/401 Pages) STMICROELECTRONICS

Part #	STR720

Description	ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES

PDF	401 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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138 / 401 page

STR720 - RESET AND CLOCK CONTROL UNIT (RCCU)

138/401

13 RESET AND CLOCK CONTROL UNIT (RCCU)

13.1 Introduction

Reset and Clock Control Unit (RCCU) is responsible of the control and distribution of the

reset and the clock signals of the STR720.

13.2 Main Features

■

Three reset inputs: Watchdog reset, Hardware reset and Software reset

■

Two clock inputs: CLK and CLK_AF

■

Three clock outputs: AHB clock (AHB_CLK), APB clock (APB_CLK) and ATAPI clock

(ATAPI_CLK)

■

PLL control including:

•

PLL operation mode (POFF output) and multiplication/division (MX and DX Output)

control

•

PLL reference (PLLREFCLK) clock selectable between CLK and CLK/2

■

Four clock domains:

•

AHB clock can be:

CLK clock,

CLK clock divided by 2, 32, 64

CLK (or CLK/2) clock multiplied by the PLL

External low frequency clock (CLK_AF, when available)

•

APB clock can be:

AHB clock divided by 2, 4, 8, 16

•

ATAPI clock can be:

AHB clock divided by 2

AHB clock divided by 3

•

PLLCKREF can be:

CLK clock

CLK clock divided by 2

■

Four different operating modes:

Run mode

Idle mode

Slow mode

Stop mode

■

Low frequency clock (CLK_AF) selection for low power consumption modes.

STR720 Datasheet(PDF) 138 Page - STMicroelectronics

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