ST6253C View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST6253C

8-bit MCUs with A/D converter, safe reset, auto-reload timer, EEPROM and SPI

STMicroelectronics 

ST6253C ST6263C ST6263B ST6260C ST6260B

CLOCK SYSTEM (Cont’d)

Figure 12. Clock Circuit Block Diagram

MAIN

OSCILLATOR

OSG

POR

: 13

Core

TIMER 1

M

U

fINT

OSCILLATOR

DIVIDER

: 12

Watchdog

X

RS0,RS1

LFAO

:1

Main Oscillator off

Figure 13. Maximum Operating Frequency (fMAX) versus Supply Voltage (VDD)

Maximum FREQUENCY (MHz)

8

7

4

6

5

4

3

fOSG

fOSG Min (at 85°C)

2

3

fOSG Min (at 125°C)

2

1

1

2.5

3

3.6

4

4.5

5

5.5

6

SUPPLY VOLTAGE (VDD)

VR01807J

Notes:

1. In this area, operation is guaranteed at the

quartz crystal frequency.

2. When the OSG is disabled, operation in this

area is guaranteed at the crystal frequency. When

the OSG is enabled, operation in this area is guar-

anteed at a frequency of at least fOSG Min.

3. When the OSG is disabled, operation in this

area is guaranteed at the quartz crystal frequency.

When the OSG is enabled, access to this area is

prevented. The internal frequency is kept a fOSG.

4. When the OSG is disabled, operation in this

area is not guaranteed

When the OSG is enabled, access to this area is

prevented. The internal frequency is kept at fOSG.

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