BU38803

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


Application

VHS VCRs and camcorders


Specifications

Parameter	Symbol	Limits	Unit
Applied voltage	VDD,VDDA,VDAD	0.3 ~ + 7.02	V
Pin applied voltage	VIN	VSS 0.3 ~ VDD + 0.3	V
Power dissipation	Pd	5001	mW
Storage temperature	Tstg	55 ~ + 125	°C

1 Reduced by 5mW for each increase in Ta of 1°C over 25°C.
2 Use with V_SS = VSSA = V_SAD, and V_DD = V_DDA = V_DAD.


Description

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. BU38803 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.