BU34675 Ver la hoja de datos (PDF) - ROHM Semiconductor

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componentes Descripción

Fabricante

BU34675

Single-chip 4-bit microcontroller for CD-DA

ROHM Semiconductor 

Optical disc ICs

FExplanation of the hardware

(1) Operates of a single power supply (VDD = 2.3 to

5.5V).

(2) Memory size

ROM:

6144 8 bits

RAM:

256 4 bits

LCD display RAM :

7 4 bits

(3) Instruction time (one cycle instruction)

1.5µsec (at 4 MHz)

(4) Sub-routine nesting: . . . . . . . . . . . . . . . . . 8 levels

(5) Interrupts: 5

External . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Internal (timer counter, serial I / O) . . . . . . . . . 2

(6) ROM data table function (6k data table region)

(7) Two power save modes STOP / HALT

FExternal dimensions (Units: mm)

BU34675

(8) On-chip 7-segment LCD driver that can drive a wide

variety of display types

Bias . . . . . . . . . . . . . . 1 / 3

Duty variation . . . . . . 1 / 3, 1 / 4 (programmable)

Internal bias resistors (approximately 50kΩ 3

stages)

(9) LCD segment output can be switched to CMOS out-

put by software.

The COM3 pin and upper three segments are one-bit

units, and the lower four segments are all selected to-

gether. At reset, switches to CMOS low-current output

port with low level polarity.

(10) Remote control receiver circuit (pulse width mea-

surement)

(11) On-chip 8-bit timer counter

(12) On-chip I / O system makes interfacing with exter-

nal LSI easy (LSB first).

(13) 8 I / O lines that can be pulled up by software

(14) 4 input lines that can be pulled up by software

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