YM2149 Description
DA7 ~DAO This is an 8 bit bidirectional data bus which is used for moving data and addresses between the SSG and CPU. In the read and write modes, DA7 ~ DAO corresponds to B7 ~ BO of the register array. In the address mode, DA3 ~ DAO is usde for the register address, and DA7 ~ DA4 is used together with A9 and A8 for the upper address.
YM2149 Key Features
- 5V single power supply
- Easy connection to 8 bit or 16 bit CPU
- Simple connection to external system through 2 sequence 8 bit 1/0 port
- Wide voicing range of 8 octaves
- Smooth attenuation by 5 bit envelope generator
- Built-in 5 bit D/A convertor
- Input of double frequency clock can be handled by built-in clock frequency divider
- TTL patible level
- Low power consumption (typical 125mW)
- 40 pin plastic OIL package