ST92185B STMicroelectronics, ST92185B Datasheet - Page 62

• Manufacturer Part Number: ST92185B
• Description: 16k/24k/32k Rom Hcmos Mcu With On-screen-display
• Manufacturer: STMicroelectronics

ST92185B - TIMING AND CLOCK CONTROLLER
5 TIMING AND CLOCK CONTROLLER
5.1 FREQUENCY MULTIPLIERS
Three on-chip frequency multipliers generate the
proper frequencies for: the Core/Real time Periph-
erals, the Display related time base.
Figure 33. Timing and Clock Controller Block Diagram
62/178
OSCOUT
OSCIN
PXFM
MCFM
Async.
Handler
SLDIV2
Oscillator
Divide
Xtal
by 2
SKWEN
FMEN
FMSL
Frequency
FMEN
Multiplier
Frequency
Multiplier
SKWL(3:0)
4 MHz real time
FML(3:0)
Main Clock Controller
Asynch.
Handler
Divide
by 2
Fimf
Skew Corrector
Hsync
(Synchronized DOTCK)
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 need (a 4 MHz or 8 MHz crystal is
assumed).
MODER.5
Div-2
ST9 Clock Control Unit (RCCU)
SKHPLS
Divide
Divide
by 2
by 2
Prescaler
SKDIV2
SKDIV2
1 to 8
(2X Pixel clock for 1X width characters)
Synchronized DOTCK / 2 to Display
to Display Storage RAM (TRI)
Memory Wait
Control
Clock
BREQ
WFI
INTCLK
VR02095A
CPUCLK