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Table 5.5
Number of States in Interrupt Handling Routine Execution Status
Object of Access
External
Device
*
8-Bit Bus
16-Bit Bus
Symbol
Internal
Memory
2-State
Access
3-State
Access
2-State
Access
3-State
Access
Instruction fetch
S
I
1 4 6+2m
2 3+m
Branch address read
S
J
Stack manipulation
S
K
Legend
m
: Number of wait states in an external device access.
Note:
*
Not available in this LSI.
5.6.5
DTC Activation by Interrupt
The DTC can be activated by an interrupt. For details, see section 8, Data Transfer Controller
(DTC).
5.7 Usage
Notes
5.7.1
Conflict between Interrupt Generation and Disabling
When an interrupt enable bit is cleared to 0 to disable interrupts, the disabling becomes effective
after execution of the instruction.
When an interrupt enable bit is cleared to 0 by an instruction such as BCLR or MOV, and if an
interrupt is generated during execution of the instruction, the interrupt concerned will still be
enabled on completion of the instruction, and so interrupt exception handling for that interrupt will
be executed on completion of the instruction. However, if there is an interrupt request of higher
priority than that interrupt, interrupt exception handling will be executed for the higher-priority
interrupt, and the lower-priority interrupt will be ignored.
The same also applies when an interrupt source flag is cleared to 0.
Figure 5.6 shows an example in which the TCIEV bit in TIER_0 of the TPU is cleared to 0.
The above conflict will not occur if an enable bit or interrupt source flag is cleared to 0 while the
interrupt is masked.
Summary of Contents for H8S/2627
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