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BU38703

Rohm
Part Number BU38703
Manufacturer Rohm
Description System control servo
Published Apr 17, 2005
Detailed Description Video ICs System control servo BU38603 / BU38703 / BU38803 The BU38603, BU38703 and BU38803 are servo controller ICs fo...
Datasheet PDF File BU38703 PDF File

BU38703
BU38703

Overview
Video ICs System control servo BU38603 / BU38703 / BU38803 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.
Applications • VHS VCRs and camcorders 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 mas...


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