Oki ML63611, User Manual

Page: 141 / 271

ML63611 User’s Manual
Chapter 11 Melody Driver (MELODY)
11 – 1
OPTION B (D): 1.5 V (3.0 V), With regulator
circuit for LCD bias
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
11. Melody Driver (MELODY)
11.1 Overview
The ML63611 has an internal melody circuit and buzzer circuit.
While automatically reading melody data in ROM (program memory) as specified by an MSA instruction, the
melody circuit outputs a melody signal via the MD and MDB pins.
The output voltage level of the MDB pin when the melody is OFF can be selected as either V
DD
or V
SS
using the
mask option. Refer to Section 1.3, “Mask Options” and the “MOGTOOL Mask Option Generator User’s Manual”
for details.
The melody circuit can select 29 different tones, 63 different tone lengths, and 15 different tempos.
The buzzer circuit has four different buzzer output modes at a frequency of 4 kHz. The buzzer driver signal is
output via the MD and MDB pins.
Melody output is a higher priority operation than buzzer output.
11.2 Melody Driver Configuration
The melody driver configuration is shown in Figure 11-1.
Figure 11-1 Melody Driver Configuration
Data bus
Melody end interrupt
request
MSA instruction
Melody data request
Melody data
MD
MDB
14
TEMPO MDCON
Melody circuit
Buzzer circuit
4 4
4 4