SM5M2 datasheet(14/28 Pages) SHARP

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SM5M2

- 14 -

FUNCTIONAL DESCRIPTION

Voice Synthesizer

• How to select a voice start address

There is a voice start address and RC, composed

of 8-bit to select a voice start address. Voice start

address is 16 bits. However, RC register can points

only upper 8 bits in voice start address in partial.

Lower 8-bit is always fixed "0". Refer to "RC

Minimum unit (shortest block) is equal voice ROM

capacity. Each minimum unit is composed of 256

steps. Refer to Fig.9.

Core CPU detects the status whether voice

synthesizer run or not, by reading the content of

P33 flag. (P33 flag is "1" during voice generation.)

Terminator (11111B) can be set as a voice data in

the voice ROM.

When controller found a terminator, immediately

stops voice and reset a flag.

When reached the bottom of the voice data

address, voice data address automatically becomes

0000H and voice continuously generates until come

across a terminator.

CPU can reset the P33 flag and stop voice

generation by force.

NOTE :

Voice ROM data "11111" means terminator of voice data.

That is, an encoder must encode voice data except "11111".

• Voice sampling frequency (5 kHz / 7 kHz)

In case of sampling frequency is 5 kHz, total

generation period becomes 12.8 s. In case of 7

kHz, it's 9.1 s.

Voice sampling frequency (5 kHz or 7 kHz) is

selected by RD3 register. In case of RD3 is "0",

voice sampling frequency becomes 7 kHz. In case

of RD3 is "1", it's 5 kHz.

• RC register

The RC register is composed of 8-bit. It can points

only upper 8 bits in the voice start address as

shown below. The data is filled with both A and X

registers.

NOTE :

A voice start address is corresponding to the RC register (8

bits). Maximum 256 (SM5M2) pieces of voice start address

can be selected. Each voice start address is based on

multiple number of 100H. When voice generates, P33 flag

becomes "1".

First set the sampling rate of the voice synthesizer.

The voice synthesizer start address is corre-

sponding to the RC register and the 8 bits in the

RC register are obtained by A and X register. After

setting the P33 voice flag High, the voice

synthesizer would start playing. After detect P33

Low, the voice synthesizer could play the next

section of voice.

NOTE : "x" stands for "0" or "1"

• Voice start address

Voice data

(Voice ROM)

Voice start

address

64k x 5 bits

Voice flag

0000H

0100H

0200H

0300H

0400H

0500H

0600H

0700H

X register

Acc

Start address

RC register (8 bits)

FF00H

Fig. 9

Voice ROM Configuration

SM5M2 Datasheet(PDF) 14 Page - Sharp Corporation

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