MC68HC908BD48 Datasheet, PDF (211/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

Sync Processor
Features
16.3 Features
Features of the Sync Processor include the following:
• Polarity detector
• Horizontal frequency counter
• Vertical frequency counter
• Low vertical frequency indicator (40.7Hz)
• Polarity controlled HSYNCO and VSYNCO outputs:
– From separate Hsync and Vsync
– From composite sync on HSYNC or SOG input pin
– From internal selectable free running Hsync and Vsync pulses
• CLAMP pulse output to the external pre-amp chip
• Internal schmitt trigger on HSYNC, VSYNC, and SOG input pins
to improve noise immunity
16.4 I/O Pins
The Sync Processor uses six I/O pins, with four pins shared with
standard port I/O pins. The full name of the Sync Processor I/O pins are
listed in Table 16-1. The generic pin name appear in the text that
follows.
Sync Processor
Generic Pin Names:
HSYNC
VSYNC
SOG
HSYNCO
VSYNCO
CLAMP
Table 16-1. Pin Name Conventions
Full MCU Pin Names:
HSYNC
VSYNC
PTE0/SOG/TCH0
PTE1/HSYNCO
PTE2/VSYNCO
PTD4/CLAMP
Pin Selected for
Sync Processor Function By:
—
—
SOGE bit in CONFIG1 ($001D)
HSYNCOE bit in CONFIG 1 ($001D)
VSYNCOE bit in CONFIG 1 ($001D)
CLAMPE bit in PDCR ($0049)
MC68HC908BD48 — Rev. 1.0
MOTOROLA
Sync Processor
Technical Data
211