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YMF754-R Datasheet(PDF) 42 Page - YAMAHA CORPORATION |
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YMF754-R Datasheet(HTML) 42 Page - YAMAHA CORPORATION |
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42 / 60 page  YMF754 June 28, 1999 -42- 2-2-4. SB IRQ Status F8h: Interrupt Flag Register Read Only Default: 00h b7 b6 b5 b4 b3 b2 b1 b0 - - - - - - - SBI b0................SBI: SB Interrupt Flag This bit indicates that the SB DSP occurs the interrupt. This bit is read only. Thus, read the SB DSP read port to clearing the interrupt and this bit. Then, the value of the read port is invalid. 2-3. MPU401 MPU401 block is for transmitting and receiving MIDI data. It is compatible with UART mode of “MPU401”. Full duplex operation is possible using the 16-byte FIFO for each direction, transmitting and receiving. The following shows the MPUBase I/O map for MPU401. MPUBase (R/W) MIDI Data port MPUBase + 1h (R) Status Register port MPUBase + 1h (W) Command Register port port D7 D6D5D4 D3D2 D1D0 +0h Data +1h (W) Command +1h (R) /DSR /DRR -- -- -- |
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