Irq Sense Control Register (Iscr) - Hitachi H8/3032 Series Hardware Manual

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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 to IRQ .
4 0
Bit 7
— —
Initial value
0
Read/Write R/W R/W
Reserved bit
ISCR is initialized to H'00 by a reset and in hardware standby mode.
Bits 7 to 5—Reserved: These bits can be written and read, but they do not select level or falling-
edge sensing.
Bits 4 to 0—IRQ to IRQ Sense Control (IRQ4SC to IRQ0SC): These bits selects whether
4 0
interrupts IRQ to IRQ are requested by level sensing of pins IRQ
4 0
sensing.
Bits 4 to 0
IRQ4SC to IRQ0SC Description
0 Interrupts are requested when IRQ
1 Interrupts are requested by falling-edge input at IRQ
6 5 4 3
— IRQ4SC IRQ3SC
0 0 0 0
R/W R/W R/W
IRQ to IRQ sense control
4
These bits select level sensing or falling-edge
sensing for IRQ
to IRQ
4
87
2 1 0
IRQ2SC IRQ1SC IRQ0SC
0 0 0
R/W R/W R/W
0
to IRQ interrupts
4 0
to IRQ , or by falling-edge
4 0
inputs are low (Initial value)
0
to IRQ
4 0