ST72C104G2B7(2000_11) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72C104G2B7
(Rev.:2000_11)

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

STMicroelectronics 

ST72104G, ST72215G, ST72216G, ST72254G

7.6 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

register 1 (MISCR1).

The MCC block consists of:

s A programmable CPU clock prescaler

s 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 11 "MISCELLANEOUS REGIS-

TERS" on page 36 for more details.

Figure 14. Main Clock Controller (MCC) Block Diagram

fOSC/2

PORT

ALTERNATE

FUNCTION

MISCR1

- - MCO -

- CP1 CP0 SMS

CLOCK TO CAN

PERIPHERAL

MCO

fOSC

DIV 2

DIV 2, 4, 8, 16

fCPU

CPU CLOCK

TO CPU AND

PERIPHERALS

24/140

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