Rainbow Electronics AT76C551 - Manual (Page 30)

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AT76C551
1612D–08/01
MIR3 – PIR4: Processor Interface Register 4
addr: 80000C hex R/W 16 bits
• Bits 15..8 – PIR4[15:8]
General purpose I/O
MIR3 bits 15..8 are reflected to bits 7..0 of MR8 so that the host can read them.
• Bits 7..0 – PIR4[7:0]
General purpose I/O
MIR3 bits 7..0 are reflected to bits 7..0 of MR7 so that the host can read them.
Note: Default Value: 0000 hex
MIR0 – MIR3 provide a means of one-way communication from AT76C551 firmware to the
host driver software. Each MIR bit, or field, can carry any kind of information required by the
interface between host driver software and AT76C551 firmware. The MIR4-MIR5 provide a
means of one-way communication from the host driver software to AT76C551 firmware. See
also GCR (SIR0) and GPR1 - GPR3 (SIR6 - SIR8).
MIR4 – PIR5: Processor Interface Register 5
addr: 800010 hex R/W 16 bits
• Bits 15..8 – PIR5[15:8]
General purpose I/O
MIR4 bits 15..8 reflect bits 7..0 of GPR2 (SIR7), which can be written by the host.
• Bits 7..0 – PIR5[7:0]
General purpose I/O
MIR4 bits 7..0 reflect bits 7..0 of GPR1 (SIR6), which can be written by the host.
Note: Default Value: 0000 hex
MIR5 – PIR6: Processor Interface Register 6
addr: 800014 hex R/W 16 bits
• Bits 15..8 – PIR6[15:8]
General purpose I/O
MIR5 bits 15..8 reflect bits 7..0 of GCR (SIR0), which can be written by the host.
• Bits 7..0 – PIR6[7:0]
General purpose I/O
MIR5 bits 7..0 reflect bits 7..0 of GPR3 (SIR8), which can be written by the host.
Note: Default Value: 0000 hex