mc68hc908ld64 Freescale Semiconductor, Inc, mc68hc908ld64 Datasheet - Page 252

• Manufacturer Part Number: mc68hc908ld64
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Sync Processor
17.2 Introduction
17.3 Features
Data Sheet
252
NOTE:
The Sync Processor is designed to detect and process sync signals
inside a digital monitor system — from separated Hsync and Vsync
inputs. After detection and the necessary polarity correction and/or sync
separation, the corrected sync signals are sent out. The MCU can also
send commands to other monitor circuitry, such as for the geometry
correction and OSD, using the DDC12AB and/or the IIC communication
channels.
The block diagram of the Sync Processor is shown in
All quoted timings in this section assume an internal bus frequency of
6MHz.
Features of the Sync Processor include the following:
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Polarity detector
Horizontal frequency counter
Vertical frequency counter
Low vertical frequency indicator (40.7Hz)
Polarity controlled HOUT and VOUT outputs:
– From separate Hsync and Vsync
– From composite sync on HSYNC input pin
– From internal selectable free running Hsync and Vsync pulses
Free-running Hsync, Vsync, DE, and DCLK of 4 video modes
CLAMP pulse output to the external pre-amp chip
Internal schmitt trigger on HSYNC, and VSYNC input pins to
improve noise immunity
Sync Processor
MC68HC908LD64
Freescale Semiconductor
Figure
17-2.
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Rev. 3.0