ST72C254G2 datasheet(24/135 Pages) STMICROELECTRONICS

部件名	ST72C254G2

功能描述	8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, I2C INTERFACES

PDF	135 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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24 / 135 page

ST72104G, ST72215G, ST72216G, ST72254G

24/135

6.6 MAIN CLOCK CONTROLLER (MCC)

The Main Clock Controller (MCC) supplies the

clock for the ST7 CPU and its internal peripherals.

It allows SLOW power saving mode to be man-

aged by the application.

All functions are managed by the Miscellaneous

The MCC block consists of:

A programmable CPU clock prescaler

A clock-out signal to supply external devices

The prescaler allows the selection of the main

clock frequency and is controlled by three bits of

the MISCR1: CP1, CP0 and SMS.

The clock-out capability consists of a dedicated

I/O port pin configurable as an fCPU clock output to

drive external devices. It is controlled by the MCO

bit in the MISCR1 register.

See Section 10 ”MISCELLANEOUS REGIS-

TERS” on page 36 for more details.

Figure 14. Main Clock Controller (MCC) Block Diagram

DIV2,4,8,16

DIV 2

SMS

CP1 CP0

CPU CLOCK

MISCR1

CLOCK TO CAN

TO CPU AND

PERIPHERALS

fOSC

fCPU

MCO

PORT

FUNCTION

ALTERNATE

MCO

fOSC/2

PERIPHERAL

ST72C254G2 数据表(PDF) 24 Page - STMicroelectronics

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