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Appendix B Internal I/O Registers
BRCR—Bus Release Control Register
Bit
Modes
Initial value
1, 2, 6, 7
Read/Write
Modes
Initial value
3, 4
Read/Write
Initial value
Mode 5
Read/Write
ISCR—IRQ Sense Control Register
7
Bit
Initial value
0
Read/Write
R/W
Rev. 4.00 Jan 26, 2006 page 798 of 938
REJ09B0276-0400
7
6
5
A23E
A22E
A21E
1
1
1
1
1
1
R/W
R/W
R/W
1
1
1
R/W
R/W
R/W
Address 23 to 20 enable
0
Address output
Other input/output
1
6
5
4
IRQ5SC
IRQ4SC
0
0
0
R/W
R/W
R/W
IRQ
to IRQ
sense control
5
0
Interrupts are requested when IRQ
0
Interrupts are requested by falling-edge input at IRQ
1
H'EE013
4
3
2
A20E
1
1
1
0
1
1
1
1
1
R/W
Bus release enable
H'EE014
3
2
IRQ3SC
IRQ2SC
IRQ1SC
0
0
R/W
R/W
R/W
to IRQ
5
Bus controller
1
0
BRLE
1
0
R/W
1
0
R/W
1
0
R/W
The bus cannot be
released to an
0
external device
The bus can be
1
released to an
external device
Interrupt Controller
1
0
IRQ0SC
0
0
R/W
are low
0
to IRQ
5
0
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