The BU38603, BU38703 and BU38803 are servo controller ICs for VCRs. They contain a high-speed, 8-bit CPU and perform the processing required for the drum, capstan, FV and PV completely in software, allowing a large reduction in the number of external components required. They also contain high-performance linear amplifiers, eliminating the need for interface ICs. Specialized hardware is included for items that require high-speed processing, to allow efficient utilization of the CPU. Features 1) CPU 499 commands (69 types) Memory-mapped I / O Minimum command execution time: 250ns (8MHz) 2)ROM capacity BU38603: 16384 × 8 bit BU38703: 24576 × 8 bit BU38803: 32768 × 8 bit 3) RAM capacity: 512 × 8bit 4) Interrupt Pattern generator: 1 Watch-dog timer: 1 External interrupts: 1 FG interrupts: 5 Internal interrupts: 7 Two timers, serial transmission, interrupt, VHSW, CTL interval timer (fixed) / VISS * Multi-layer interrupts possible. 5) Free-running counter: 19 bit 6) PWM output: 12 bit × 2 7) Pattern generator 17 bits from FRC MSB used. Output Internal: 3 bit External (PO): 5 bit External (PIO): 6 bit 8) Programmable pre-scaler CFG: 7 bit CTL: 6 bit 9) Head amplifier / chroma rotary Generated from pattern generator output. 10) Built-in AGC. Five-bits used to switch the gain control registers for the CTL amplifier. 11) CTL counter: 1 / 30 or 1 / 25 12) Data shift PLL calculation: 24 bit 13) Timer: 8 bit × 2 14) Synchronous serial input/output: 8 bit × 1 15) VH PULSE V separeted from composite synchronous snal. Pseudo V generated from pattern generator output. Superimposed pseudo H synchronized with the composite synchronous signal. 16) VISS / VASS VASS 0 / 1 discrimination VISS discrimination threshold: 3 Aspect discrimination. D / A CTL switching. 17) Standard I / O Parallel I / O (PIO): 32 bit Parallel output (PO): 6 bit 18) A / D converter: 8 bits × 8 channels Can be masked-programmed to be parallel inputs. 19) Watch-dog timer Setting period: 4 20) Linear circuits DFG: amplifier / comparator CFG: amplifier / comparator CTL: differential amplifier / comparator DPG: comparator Applications VHS VCRs and camcorders
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