SM5L1 데이터 시트보기 (PDF) - Sharp Electronics

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SM5L1

4-Bit Single Chip Microcomputers

Sharp Electronics 

4-Bit Single Chip Microcomputers

SM5L1/SM5L2/SM5L3

FUNCTIONAL DESCRIPTION

Melody Output Function

The built-in melody generation circuit provides a

variety of sound signals. Figure 20 shows the block dia-

gram of the melody generating circuit.

The melody ROM can store notes, rest and stop

commands in 160/256/256 step (1 step consists of 6-

bits), allowing the generation of 12 scale over two

octaves (555 to 2,097 Hz) and the section of the time

base for notes (125/62.5 ms).

f8

(128 Hz)

NOTE:

RD0 flag: Bit 0 of RD register

RD1 flag: Bit 1 of RD register

MELODY ROM ADDRESS SET

16 Hz

8-BIT PRESET BINARY COUNTER

(MELODY ROM ADDRESS POINTER)

8 Hz

MELODY ROM

160-STEP x 6-BIT (SM5L1)

256-STEP x 6-BIT (SM5L2/L3)

PRESET

SIGNAL

TIME BASE

SELECT SIGNAL

REST TELL SIGNAL

DECODER

RD1 FLAG

RD0 FLAG

MELODY

START/STOP

FLAG

N-STAGE COUNTER

F PIN

Figure 20. Melody Generating Circuit

32.768 kHz

5L1-20

Microcomputer Data Sheet

15

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