HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 135
HD6412340
Manufacturer Part Number
HD6412340
Description
H8S/2345 F-ZTAT Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6412340.pdf
(907 pages)
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5.4
5.4.1
Interrupt operations in the H8S/2345 Series differ depending on the interrupt control mode.
NMI interrupts are accepted at all times except in the reset state and the hardware standby state. In
the case of IRQ interrupts and on-chip supporting module interrupts, an enable bit is provided for
each interrupt. Clearing an enable bit to 0 disables the corresponding interrupt request. Interrupt
sources for which the enable bits are set to 1 are controlled by the interrupt controller.
Table 5.5 shows the interrupt control modes.
The interrupt controller performs interrupt control according to the interrupt control mode set by
the INTM1 and INTM0 bits in SYSCR, the priorities set in IPR, and the masking state indicated
by the I and UI bits in the CPU’s CCR, and bits I2 to I0 in EXR.
Table 5.5
Interrupt
Control Mode INTM1 INTM0 Registers
0
—
2
—
116
Interrupt Operation
Interrupt Control Modes and Interrupt Operation
Interrupt Control Modes
0
1
SYSCR
0
1
0
1
Priority Setting
—
—
IPR
—
Interrupt
Mask Bits Description
I
—
I2 to I0
—
Interrupt mask control is
performed by the I bit.
Setting prohibited
8-level interrupt mask control
is performed by bits I2 to I0.
8 priority levels can be set with
IPR.
Setting prohibited
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