Specifications
I-82 EPSON S1C62N82 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Melody Generator)
1/2
divider
1/2
divider
1/2
divider
To note generator
Divider
output
signal
1/2
divider
V
DD
V
SS
TEMPC
Mask option
TS3TS2TS1TS0
TEMPC
Fig. 4.11.7
Tempo generator
Fig. 4.11.8
Note generator
(h)Note generator
This is a generator which counts the tempo generator
output and creates various notes. Its configuration is
shown in Figure 4.11.8. It consists of counters in which
3 bits can be set. Each counter is set by the 3 bits (D6–
D8) from the melody ROM causing the counter dividing
ratio to change and hence various notes are generated.
The bit settings and the corresponding notes generated
are shown in Table 4.11.4. The counter output becomes
the note playing end signal and the address of the melody
ROM is incremented 1 step at a time.
Tempo generator
output signal
1/2
divider
1/2
divider
1/2
divider
D8
Note playing
signal
D7
D6
Melody ROM output
(D6–D8)
0
0
0
0
1
1
1
1
D8
0
0
1
1
0
0
1
1
D7
0
1
0
1
0
1
0
1
D6 Note
+
Table 4.11.4
Note data and notes