ST6255C datasheet(21/84 Pages) STMICROELECTRONICS

21 / 84 page

21/84

ST6255C ST6265C ST6265B

CLOCK SYSTEM (Cont’d)

Figure 11. Clock Circuit Block Diagram

Figure 12. Maximum Operating Frequency (fMAX) versus Supply Voltage (VDD)

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.

MAIN

OSCILLATOR

OSG

LFAO

Core

: 13

: 12

: 1

TIMER 1

Watchdog

POR

fINT

Main Oscillator off

OSCILLATOR

DIVIDER

RS0,RS1

2.5

3.64

4.55

5.5

Maximum FREQUENCY (MHz)

SUPPLY VOLTAGE (VDD)

fOSG

fOSG Min (at 85°C)

VR01807J

fOSG Min (at 125°C)

ST6255C 数据表(PDF) 21 Page - STMicroelectronics

ST6255C 数据表(HTML) 21 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84

数据表下载