YMF795

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Contents

■General Description of YMF795 .................................................................................................................. 3

■Block Description ......................................................................................................................................... 4

■Pin Configuration.......................................................................................................................................... 5

■Pin Description ............................................................................................................................................. 6

■Block Diagram.............................................................................................................................................. 7

■Register Map................................................................................................................................................. 8

■Explanation of Registers............................................................................................................................... 9

□Musical score data register .................................................................................................................... 9

□Timbre data register............................................................................................................................. 14

□Other control data ................................................................................................................................ 17

■Power-down control division diagram........................................................................................................ 21

■Explanation of each bit ............................................................................................................................... 21

■On Reset ..................................................................................................................................................... 24

■Settings and Procedure required for a piece generation.............................................................................. 24

■Clock Frequency Setting............................................................................................................................. 24

■On Interrupt Sequence ................................................................................................................................ 25

■State Transition........................................................................................................................................... 26

■Operation in FIFO empty condition............................................................................................................ 28

■Reproduction method assuming occurrence of empty state........................................................................ 28

■Example of peripheral circuit...................................................................................................................... 29

(1) Circuit diagram and wiring diagram when two power supplies are used:............................................... 30

(2) Circuit diagram and wiring diagram when one power supply and one voltage regulator IC are used: ... 31

■Volume level Adjustment in monophonic sound and 4-sound generation ................................................. 33

■Sound Quality Correction Circuit ............................................................................................................... 35

■Serial I/F Specifications.............................................................................................................................. 37

■Electrical Characteristics ............................................................................................................................ 38

■General description of FM sound generator ............................................................................................... 43

■External dimensions.................................................................................................................................... 44