HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 108

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

5.2.5 IRQ Sense Control Register (ISCR)
ISCR is an 8-bit readable/writable register that selects level sensing or falling-edge sensing of the
inputs at pins IRQ
ISCR is initialized to H'00 by a reset and in hardware standby mode.
Bits 7 and 6—Reserved: These bits can be written and read, but they do not select level or
falling-edge sensing.
Bits 5 to 0—IRQ
interrupts IRQ
sensing.
Bits 5 to 0
IRQ5SC to IRQ0SC Description
0
1
Bit
Initial value
Read/Write
5
to IRQ
5
5
to IRQ
to IRQ
Reserved bits
R/W
Interrupts are requested when IRQ
Interrupts are requested by falling-edge input at IRQ
0
—
7
0
are requested by level sensing of pins IRQ
0
0
.
Sense Control (IRQ5SC to IRQ0SC): These bits select whether
R/W
—
6
0
IRQ5SC
R/W
5
0
94
IRQ4SC
R/W
IRQ to IRQ sense control
These bits select level sensing or falling-edge
sensing for IRQ to IRQ interrupts
4
0
5
5
to IRQ
IRQ3SC
R/W
3
0
0
0
inputs are low
5
to IRQ
5
IRQ2SC
R/W
2
0
5
0
to IRQ
, or by falling-edge
0
IRQ1SC
R/W
0
1
0
(Initial value)
IRQ0SC
R/W
0
0