YMF795 Datasheet, PDF (2/45 Pages) YAMAHA CORPORATION – APL-2 Automobile sound Player-2

Contents
YMF795
■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
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