Specifications

S1C62N82 TECHNICAL SOFTWARE EPSON II-61

CHAPTER 3: PERIPHERAL CIRCUITS (Melody Generator)

(1) Tempo

Tempo selection is asigned to address 0F2H bit D1

(TEMPC).

This bit should be set at the same time that the MELC bit

is set to "1". During playing, this bit will have no function

for the melody playing. But in the level hold mode, when

the next melody is loading, TEMPC will also be loaded.

The tempo will then be changed. The control procedure is

as follows:

Tempo and speed control

Set TEMPC bit to "1"

Set melody 2 address

Enable interrupt

Jump to

melody subroutine

Melody 1 end

interrupt

10AH

Melody subroutine

RET

Set TEMPC

bit to "0"

Set MELC bit to "1"

Melody 2 end

interrupt

Set MELD bit to "0"

Set melody 1 address

MELC

MO Melody 1 with tempo 0

Interrupt generate by END data setting

Melody 2 with tempo 1

Fig. 3.11.5

Control procedure of tempo