Specifications

I-78 EPSON S1C62N82 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Melody Generator)
(c)Address register
The configuration of the melody ROM address registers is
shown in Figure 4.11.4. It consists of the 7-bit register in
the I/O RAM space. The addresses are "0F0H" and
"0F1H". The data of these registers indicate the ad-
dresses of the melody ROM which become the addresses
of the melody ROM when the melody is started. These
melody ROM addresses are written to the melody ROM
address counter when the melody playing begins, i.e.,
before the the melody playing begins, the desired melody
may be played from among the melodies written in the
melody ROM by setting data on these registers.
MAD0
(D0)
MAD1
(D1)
MAD2
(D2)
MAD3
(D3)
Data bus
Address "0F0H"
To Address counter
MAD4
(D0)
MAD5
(D1)
MAD6
(D2)
Address "0F1H"
Fig. 4.11.4
Address register