ST92196A STMicroelectronics, ST92196A Datasheet - Page 67

• Manufacturer Part Number: ST92196A
• Description: 8/16-bit Mcu For Tv Applications With Up To 96k Rom, On-screen-display And 1 Or 2 Data Slicers
• Manufacturer: STMicroelectronics

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-
Figure 32. Timing and Clock Controller Block Diagram
67/268
TIMING AND CLOCK CONTROLLER (TCC)
OSCIN
OSCOUT
FCPU
FOSD
FOSD
XTAL
OSC
SKDIV2
BY 2
DIV
FMEN
SKWEN SKWL [3:0]
FREQUENCY
FREQUENCY
MULTIPLIER
MULTIPLIER
4MHz REAL CLOCK
4MHz REAL CLOCK
TO IR, SCI, DS...
TO IR, SCI, DS...
FML [3:0]
FMEN
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).
CORRECTOR
CONTROLLER
MAIN CLOCK
WAIT FOR INTERRUPT
BUS REQUEST
MEMORY WAIT STATE
SKEW
HSYNC
FMSL
(MODER.5)
(MODER.5)
DIV 2
DIV 2
FPIXC
BY 2
BY 2
DIV
DIV
BY 2
DIV
PRS [2:0]
CONTROL
SYNCHRONISED CLOCK
TO OSDRAM CONTROLLER
PIXCLK
TO DISPLAY CONTROLLER
CLOCK
INTCLK
CLOCK) TO TIMER,
ADC, SPI.
ADC, SPI.
CPU
PRESCALER
(PERIPHERAL
CPUCLK
(CORE
CLOCK)