ST92196A datasheet(67/268 Pages) STMICROELECTRONICS

Numer części	ST92196A

Szczegółowy opis	8/16-BIT MCU FOR TV APPLICATIONS WITH UP TO 96K ROM, ON-SCREEN-DISPLAY AND 1 OR 2 DATA SLICERS

PDF	268 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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TIMING AND CLOCK CONTROLLER (TCC)

6 TIMING AND CLOCK CONTROLLER (TCC)

6.1 FREQUENCY MULTIPLIERS

Two on-chip frequency multipliers generate the

proper frequencies for: the Core/Real time Periph-

erals and the Display related time base.

They follow the same basic scheme based on an

integrated VCO driven by a three state phase

comparator and a charge-pump (1 pin used for off-

chip filtering components; a resistor in series with

a capacitor tied to ground).

For both the Core and the Display frequency mul-

tipliers, a 4 bit programmable feed-back counter

allows the adjustment of the multiplying factor to

the application needs (a 4 MHz crystal is as-

sumed).

Figure 32. Timing and Clock Controller Block Diagram

FOSD

FCPU

SYNCHRONISED CLOCK

TO OSDRAM CONTROLLER

PIXCLK

TO DISPLAY CONTROLLER

FPIXC

SKWEN SKWL [3:0]

4MHz REAL CLOCK

TO IR, SCI, DS...

WAIT FOR INTERRUPT

BUS REQUEST

MEMORY WAIT STATE

CPU

CLOCK

CONTROL

PRESCALER

MAIN CLOCK

CONTROLLER

DIV 2

(MODER.5)

FMSL

FREQUENCY

XTAL

OSC

MULTIPLIER

BY 2

DIV

SKDIV2

FML [3:0]

FMEN

DIV

BY 2

DIV

FREQUENCY

MULTIPLIER

PRS [2:0]

FMEN

INTCLK

ADC, SPI.

OSCOUT

OSCIN

SKEW

CORRECTOR

CPUCLK

(CORE

CLOCK)

CLOCK) TO TIMER,

HSYNC

(PERIPHERAL

FOSD

4MHz REAL CLOCK

TO IR, SCI, DS...

DIV 2

(MODER.5)

BY 2

DIV

ADC, SPI.

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