L9805 Просмотр технического описания (PDF) - STMicroelectronics

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L9805

Super Smart Power Motor Driver with 8-BIT MCU, CAN Interface, 16K EPROM, 256Bytes RAM, 128 Bytes EEPROM, 10 Bit ADC, WDG, 2 Timers, 2 PWM Modules, Full H-Bridge Driver

STMicroelectronics 

L9805

CLOCK SYSTEM (Cont’d)

3.1.2 External Clock

An external clock may be applied to the OSCIN in-

put with the OSCOUT pin not connected, as

shown on Figure 4. The tOXOV specifications does

not apply when using an external clock input. The

equivalent specification of the external clock

source should be used instead of tOXOV (see ).

Figure 7. Timing Diagram for Internal CPU Clock Frequency transitions

OSC/2

OSC/4

OSC/8

CPU CLK

b1 : b2

00

01

MISCELLANEOUS REGISTER

b0

1

New frequency

New frequency active when

requested

osc/4 & osc/8 = 0

10

Normal mode active

(osc/4 - osc/8 stopped

Normal mode

requested

VR02062B

15/103

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