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BU34381 Scheda tecnica(PDF) 9 Page - Rohm |
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BU34381 Scheda tecnica(HTML) 9 Page - Rohm |
9 / 10 page 99 Optical disc ICs BU34381 FHardware descriptions (1) Operates on a single power supply (VDD = 2.7 X 5.5V) (2) Memory size ROM : 12288 8 bits RAM : 512 4 bits LCD display RAM : 20 4 bits (3) Instruction execution time (1 cycle instruction) 1.5 µsec: (at 4MHz) (4) Subroutine nesting : 8 levels (5) Interrupts : 6 factors External : 3 factors Internal (time counter, serial I / O) : 3 factors (6) ROM data table function (data table area: 12KB) (7) Two energy-saving modes (STOP / HALT) (8) Internal 20-segment LCD driver adaptable for vari- ous types of displays Bias : 1 / 3 Duty settings : 1 / 3, 1 / 4 (programmable) Internal bias resistor (3 stages, approx. 50k Ω) (9) LCD segment output is program-switchable to CMOS output All 20 segments can be selected in 4-bit groups Resetting: CMOS small-current output port, LOW polarity (10) Internal remote control receiver (pulse width count- er) (11) Internal 8-channel, 8-bit A / D converter (12) A / D input is programmable in 1-bit units as digital input (13) Internal 8-bit timer counter (also used as event counter) (14) Two internal serial input / outputs (LSB fast) that simplify interface with external LSI chips (15) 12 input / outputs (programmable pull-up) (16) 5 inputs (programmable pull-up) |
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