HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 828

• Manufacturer Part Number: HD6433045
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

BRCR—Bus Release Control Register
ISCR—IRQ Sense Control Register
Bit
Initial value
Read/Write
IER—IRQ Enable Register
Bit
Initial value
Read/Write
Bit
Modes
1, 2,
5, 7
Modes
3, 4, 6
Initial value
Read/Write
Initial value
Read/Write
R/(W)
R/W
—
—
7
0
7
0
A23E
Address 23 to 21 enable
R/W
0 Address output
1 Other input/output
—
7
1
1
R/(W)
R/W
IRQ to IRQ sense control
—
—
6
0
6
0
0 Interrupts are requested when IRQ to IRQ inputs are low
1 Interrupts are requested by falling-edge input at IRQ to IRQ
A22E
R/W
—
6
1
1
5
IRQ5SC
IRQ5E
R/(W)
R/W
5
0
5
0
A21E
R/W
0
—
5
1
1
IRQ to IRQ enable
Bus release enable
0 IRQ to IRQ interrupts are disabled
1 IRQ to IRQ interrupts are enabled
0 The bus cannot be released to an external device
1 The bus can be released to an external device
IRQ4SC
IRQ4E
R/(W)
5
821
R/W
4
0
4
0
5
5
—
—
—
4
1
1
IRQ3SC
0
IRQ3E
R/(W)
R/W
3
0
3
0
0
0
—
—
—
3
1
1
IRQ2SC
IRQ2E
R/(W)
H'F3
H'F4
H'F5
R/W
5
2
0
2
0
—
—
—
2
1
1
IRQ1SC
Interrupt controller
0
Interrupt controller
IRQ1E
R/(W)
R/W
1
0
1
0
—
—
—
Bus controller
1
1
1
5
IRQ0SC
IRQ0E
R/(W)
R/W
0
0
0
0
BRLE
R/W
R/W
0
0
0
0