mc68hc05bs8 Freescale Semiconductor, Inc, mc68hc05bs8 Datasheet - Page 77

• Manufacturer Part Number: mc68hc05bs8
• Description: Mc68hc05 Family Of Low-cost Single-chip Microcontrollers.
• Manufacturer: Freescale Semiconductor, Inc

This section describes the operation of the SSP module in the MC68HC05BS8.
9.1
The functions of the SSP include the following:
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In addition, an interrupt can be generated for each vertical frame at a user specified horizontal line
number. The SSP accepts composite signals from a video processor or separate sync inputs from
a host computer.
For separate sync inputs, the HTTL output is identical to the incoming horizontal sync with
negative sync polarity. The VTTL output is triggered by the leading edge of the incoming sync
pulse, and the sync pulse reshaper will correct the pulse width to a certain time period regardless
of the incoming sync width. Reassembled sync pulses are inserted for HTTL signal during the
vertical sync period for composite sync input.
The HSYNC, VSYNC, and CSYNC inputs have internal filters to improve noise immunity. Any
pulse that is shorter than 1.5 internal bus clock periods will be regarded as a glitch, and will be
ignored.
Note:
MC68HC05BS8
Polarity correction
Sync separation
Sync pulse reshaping
Sync pulse detection
Horizontal line counting
Vertical frequency counting
Free running signals generation
All quoted timings in this section are based on an internal bus frequency of 2MHz, i.e.
t
CYC
Introduction
=0.5 s, unless otherwise stated.
SYNC SIGNAL PROCESSOR
SYNC SIGNAL PROCESSOR
9
TPG
9