UM0224 datasheet(11/34 Pages) STMICROELECTRONICS

Part #	UM0224

Description	STR75x Demonstration Software

PDF	34 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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STR75x demonstration software

Running the demonstrations

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2.2

Clock sources

2.2.1

Clock control

The STR750 internal clocks are derived from one source mounted 4 MHz Crystal.

In this demo application, the system clock is configured as follow:

●

System clock is set to 60 MHz

●

HCLK frequency is set to 60 MHz

●

Timer clock (CK_TIM) is set to 60 MHz

●

PCLK is set to 30 MHz

●

USB clock (CK_USB) is set to 48 MHz (internal clock)

Only the RTC is clocked by a 32 kHz external oscillator.

The HCLK clock can be changed only in the "Run" sub-menu: it can be 60 MHz, 56 MHz,

48 MHz or 4 MHz.

Figure 4.

Clock Control

FREEOSC

OSC4M

OSC32K

LPOSC

PLL

CLOCK

DETECTOR

RTC

AHB & APB

DIVIDERs

/128

XT1

XT2

XRTC1

XRTC2

USB_CK

4 MHz

32 kHz

~245 kHz

1-10 MHz

Up to

64 MHz

48 MHz

CK_SYS

ALARM

WAKEUP

CK_USB 48 MHz

HCLK

up to 60 MHz

PCLK

up to 32MHz

CK_TIM

up to 60 MHz

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