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M37151M6 Datasheet(PDF) 56 Page - Renesas Technology Corp |
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M37151M6 Datasheet(HTML) 56 Page - Renesas Technology Corp |
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56 / 138 page  M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP Rev.1.00 Nov 01, 2002 page 56 of 136 REJ03B0129-0100Z 8.10.7 Reference Voltage Generating Circuit and Comparator The composite video signal clamped by the clamping circuit is input to the reference voltage generating circuit and the comparator. (1) Reference voltage generating circuit This circuit generates a reference voltage (slice voltage) by us- ing the amplitude of the clock run-in pulse in the line specified by the data slice line specification circuit. Connect a capacitor be- tween the VHOLD pin and the VSS pin, and make the length of wiring as short as possible to prevent a leakage current from be- ing generated. (2) Comparator The comparator compares the voltage of the composite video signal with the voltage (reference voltage) generated in the refer- ence voltage generating circuit, and converts the composite video signal into a digital value. Fig. 8.10.10 Clock Run-in Detect Register 8.10.8 Start Bit Detecting Circuit This circuit detects a start bit at the line decided in the data slice line specification circuit. The detection of a start bit is as follows:. ➀ A sampling clock is generated by dividing the reference clock out- put by the timing signal. ➁ A clock run-in pulse is detected by the sampling clock. ➂ After detection of the pulse, a start bit pattern is detected from the comparator output. 8.10.9 Clock Run-in Determination Circuit This circuit determinates clock run-in by counting the number of pulses in a window of the composite video signal. The reference clock count value in one pulse cycle is stored in bits 3 to 7 of the clock run-in detect register (address 00E416). Read out these bits after the occurrence of a data slicer interrupt (refer to “8.10.12 Interrupt Request Generating Circuit”). Figure 8.10.10 shows the structure of the clock run-in detect register. b7 b6 b5 b4 b3 b2 b1 b0 Clock run-in detect register (CRD) [Address 00E416] R W Clock Run-in Detect Register 0 to 2 0 R— Test bits 3 to 7 Number of reference clocks to be counted in one clock run-in pulse period. Clock run-in detection bit(CRD3 to CRD7) 0 R— Read-only After reset Functions Nam Be |
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