YMF754-R datasheet(42/60 Pages) YAMAHA

42 / 60 page

YMF754

June 28, 1999

-42-

2-2-4. SB IRQ Status

F8h: Interrupt Flag Register

Read Only

Default: 00h

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

D6D5D4

D3D2

D1D0

+0h

Data

+1h (W)

Command

+1h (R)

/DSR

/DRR

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