| # |
Pin |
Function |
| 1/12 |
GND |
Ground Terminals |
| 2–9 |
D0 – D7 |
8-bit Bidirectional data bus |
| 10 |
NC |
Not connected |
| 11 |
/IC |
System reset, initialize registers, active low |
| 13 |
/IRQ |
Maskable Interrupt Request, active low |
| 14 |
/CS |
Chip Select, active low |
| 15 |
/WR |
Write mode on data bus, active low |
| 16 |
/RD |
Read mode on data bus, active low |
| 17 |
A0 |
Read/Write Enable, active high |
| 18 |
A1 |
Part 1 / Part 2 select (low=1, high=2) |
| 19 |
A.GND |
Analog Ground Terminal for internal D/A converter |
| 20–21 |
MOL, MOR |
Analog sound outputs, left and right |
| 22 |
A.Vcc |
Analog Vcc Terminal for internal D/A converter |
| 23 |
Vcc |
+5V Power Terminal |
| 24 |
øM |
Master Clock (7.67 MHz recommended) |
|
| /CS |
/RD |
/WR |
A0 |
A1 |
State of Data Bus |
| 0 |
1 |
0 |
0 |
0 |
Selects Part 1 Register |
| 0 |
1 |
0 |
1 |
0 |
Writes data to selected Part 1 Register. |
| 0 |
0 |
1 |
1 |
0 |
Reads the status of Part 1. |
| 0 |
1 |
0 |
0 |
1 |
Selects Part 2 register |
| 0 |
1 |
0 |
1 |
1 |
Writes data to selected Part 2 register. |
| 0 |
0 |
1 |
1 |
1 |
Reads the status of Part 2. |
| 1 |
× |
× |
× |
× |
D0 through D7 become high-impedance. |
|