Register Descriptions; Interrupt Control Register (Intcr) - Hitachi H8S/2678 Series Reference Manual

3.3

Register Descriptions

3.3.1

Interrupt Control Register (INTCR)

Bit 7
—
Initial value 0
Read/Write —
INTCR is an 8-bit readable/writable register that selects the interrupt control mode, and the
detected edge for NMI.
INTCR is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bits 7 and 6—Reserved: These bits are always read as 0 and cannot be modified.
Bits 5 and 4—Interrupt Control Mode 1 and 0 (INTM1, INTM0): These bits select either of
two interrupt control modes for the interrupt controller.
Bit 5 Bit 4
INTM1 INTM0
0 0
1
1 0
1
Bit 3—NMI Edge Select (NMIEG): Selects the input edge for the NMI pin.
Bit 3
NMIEG Description
0 Interrupt request generated at falling edge of NMI input
1 Interrupt request generated at rising edge of NMI input
Bits 2 to 0—Reserved: These bits are always read as 0 and cannot be modified.
58
6 5
— INTM1
0 0
— R/W
Interrupt
Control Mode Description
0 Interrupts are controlled by I bit
— Setting prohibited
2 Interrupts are controlled by bits I2 to I0, and IPR
— Setting prohibited
4 3
INTM0 NMIEG
0 0
R/W R/W
2 1
— —
0 0
— —
(Initial value)
(Initial value)
0
—
0
—