HD6433935 Hitachi, HD6433935 Datasheet - Page 86
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HD6433935
Manufacturer Part Number
HD6433935
Description
8-Bit MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6433935.pdf
(521 pages)
- Current page: 86 of 521
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3.3.5 Interrupt Operations
Interrupts are controlled by an interrupt controller. Figure 3-2 shows a block diagram of the
interrupt controller. Figure 3-3 shows the flow up to interrupt acceptance.
Interrupt operation is described as follows.
74
When an interrupt condition is met while the interrupt enable register bit is set to 1, an
interrupt request signal is sent to the interrupt controller.
When the interrupt controller receives an interrupt request, it sets the interrupt request flag.
From among the interrupts with interrupt request flags set to 1, the interrupt controller selects
the interrupt request with the highest priority and holds the others pending. (Refer to table 3-2
for a list of interrupt priorities.)
The interrupt controller checks the I bit of CCR. If the I bit is 0, the selected interrupt request
is accepted; if the I bit is 1, the interrupt request is held pending.
External or
internal
interrupts
External
interrupts or
internal
interrupt
enable
signals
Figure 3-2 Block Diagram of Interrupt Controller
Interrupt controller
I
CCR (CPU)
Interrupt
request
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