参数资料
型号: MC68HC05BS8FB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封装: PLASTIC, QFP-44
文件页数: 106/128页
文件大小: 9691K
代理商: MC68HC05BS8FB
MC68HC05BS8
SYNC SIGNAL PROCESSOR
9
9.3
Sync Detection
The sync detector determines whether the incoming sync signal is active. Both sync high and low
pulse widths must be within the specic values to be regarded as active. The respective HDET
and/or VDET ags will be set if the HSYNC and VSYNC signals are active.
9.4
Free-running Pseudo Sync Signal Generator
If no active sync signals are detected, a free-running sync signal generator will be enabled. It
generates a pseudo vertical sync at 63.78Hz (1/(tCYC x 31360)) and a pseudo horizontal sync at
57.14KHz (1/(tCYC x 35)). This set of free running sync signals replaces the inactive sync signals
at the inputs and will be fed to the VTTL and HTTL pins if the pins are selected for VTTL and HTTL
function.
If both vertical and horizontal sync signals are detected (VDET and HDET are set), the SOUT bit
must be set in order to output the processed signals.
Figure 9-1 Sync Signal Polarity Correction
Negative polarity pure horizontal sync signal
Positive polarity pure horizontal sync signal
Negative polarity composite sync signal
Positive polarity composite sync signal
TPG
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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