h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 148
h8s-2646
Manufacturer Part Number
h8s-2646
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2646.pdf
(1165 pages)
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Section 5 Interrupt Controller
Table 5.10 Number of States in Interrupt Handling Routine Execution Statuses
Symbol
Instruction fetch
Branch address read
Stack manipulation
Legend:
m: Number of wait states in an external device access.
5.5
5.5.1
When an interrupt enable bit is cleared to 0 to disable interrupts, the disabling becomes effective
after execution of the instruction.
In other words, when an interrupt enable bit is cleared to 0 by an instruction such as BCLR or
MOV, 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 5.8 shows an example in which the TCIEV bit in the TPU’s TIER0 register is cleared to 0.
Rev. 5.00 Sep 22, 2005 page 122 of 1136
REJ09B0257-0500
Usage Notes
Contention between Interrupt Generation and Disabling
S
S
S
I
J
K
Internal
Memory
1
2-State
Access
4
8-Bit Bus
Object of Access
3-State
Access
6+2m
External Device
2-State
Access
2
16-Bit Bus
3-State
Access
3+m
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