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
