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Microcomputer Technical Q&A
29
Q&A No.: QAH8S-025
Category: Interrupts
Subject: Interrupt Disable Timing (1)
Question
When a supporting module interrupt enable bit is cleared to 0, is the interrupt disabled
immediately?
Answer
The interrupt is disabled after execution of the instruction that clears the interrupt enable bit to 0.
However, if an interrupt request is generated during execution of the 0-clearing instruction, the
interrupt request may be accepted after execution of that instruction.
Applicable Products
Applicability Series Applicability Series Applicability Series
Yes Entire H8S Series H8S/2655 H8S/2350
H8S/2355 H8S/2357 H8S/2345
H8S/2245 H8S/2148 H8S/2144
H8S/2138 H8S/2134 H8S/2128
H8S/2124 — — — —
- Application Note 1
- Using this Application Note 4
- Contents 5
- Bus controller 6
- Power-Down State 6
- Electrical Characteristics 6
- A/D Converter 8
- I/O Ports 8
- Clock Pulse Generator 8
- Q&A No.: QAH8S-001 9
- Q&A No.: QAH8S-002 10
- Category: CPU 10
- Q&A No.: QAH8S-003 12
- Q&A No.: QAH8S-004 13
- Q&A No.: QAH8S-005 14
- Q&A No.: QAH8S-006 15
- Subject: MAC Register 15
- Q&A No.: QAH8S-007 16
- Subject: EXR Register 16
- Q&A No.: QAH8S-008 17
- Category: Instruction 17
- Subject: SUBX Instruction 17
- Q&A No.: QAH8S-009 18
- Subject: BRN Instruction 18
- Q&A No.: QAH8S-010 19
- Q&A No.: QAH8S-011 20
- Q&A No.: QAH8S-012 21
- Instruction 21
- Q&A No.: QAH8S-013 22
- Q&A No.: QAH8S-014 23
- Subject: Stack Precautions 23
- Q&A No.: QAH8S-015 24
- Subject: Stack Pointer 24
- Q&A No.: QAH8S-016 25
- Subject: TAS Instruction 25
- Q&A No.: QAH8S-017 26
- Q&A No.: QAH8S-018 28
- Q&A No.: QAH8S-019 30
- Category: MCU Operating Modes 30
- Subject: Mode Pins 30
- Q&A No.: QAH8S-020 31
- Subject: Use of RAME Bit 31
- Q&A No.: QAH8S-021 32
- Category: Exception Handling 32
- Subject: Reset 32
- Q&A No.: QAH8S-022 34
- Category: Interrupts 34
- Disabled 34
- Q&A No.: QAH8S-023 35
- Q&A No.: QAH8S-024 36
- Q&A No.: QAH8S-025 37
- Q&A No.: QAH8S-026 38
- Q&A No.: QAH8S-027 39
- Q&A No.: QAH8S-028 40
- Q&A No.: QAH8S-029 41
- Q&A No.: QAH8S-030 43
- Q&A No.: QAH8S-031 44
- Category: Bus Controller 44
- Q&A No.: QAH8S-032 45
- Subject: 45
- Q&A No.: QAH8S-033 46
- Subject: WAIT (1) 46
- Q&A No.: QAH8S-034 47
- Subject: WAIT (2) 47
- Q&A No.: QAH8S-035 49
- Q&A No.: QAH8S-036 51
- Q&A No.: QAH8S-037 52
- Q&A No.: QAH8S-038 53
- Q&A No.: QAH8S-039 55
- Q&A No.: QAH8S-040 56
- Q&A No.: QAH8S-041 57
- Q&A No.: QAH8S-042 58
- Q&A No.: QAH8S-043 59
- Q&A No.: QAH8S-044 60
- Subject: 2-CAS DRAM Interface 60
- Q&A No.: QAH8S-045 62
- Category: Power-Down State 62
- Subject: Medium-Speed Mode 62
- Q&A No.: QAH8S-046 63
- Q&A No.: QAH8S-047 64
- Q&A No.: QAH8S-048 65
- Q&A No.: QAH8S-049 66
- Q&A No.: QAH8S-050 67
- Subject: Module Stop Mode 67
- Q&A No.: QAH8S-051 68
- Q&A No.: QAH8S-052 69
- Q&A No.: QAH8S-053 70
- Subject: RD Signal Timing 70
- Q&A No.: QAH8S-054 72
- Category: Pins 72
- Q&A No.: QAH8S-055 73
- Q&A No.: QAH8S-056 74
- Q&A No.: QAH8S-057 76
- Q&A No.: QAH8S-058 77
- Subject: WDTOVF Pin 77
- Q&A No.: QAH8S-201 79
- Category: DMAC 79
- Q&A No.: QAH8S-202 80
- Q&A No.: QAH8S-203 81
- Q&A No.: QAH8S-204 82
- Q&A No.: QAH8S-205 84
- Function 84
- Q&A No.: QAH8S-206 86
- Q&A No.: QAH8S-207 87
- Q&A No.: QAH8S-208 88
- Q&A No.: QAH8S-209 90
- Q&A No.: QAH8S-210 91
- Q&A No.: QAH8S-211 92
- Q&A No.: QAH8S-212 94
- Subject: DREQ Signal Input 94
- Q&A No.: QAH8S-213 95
- Category: DTC 95
- Subject: Nature of DTC 95
- Q&A No.: QAH8S-214 96
- Q&A No.: QAH8S-215 97
- Q&A No.: QAH8S-216 98
- Q&A No.: QAH8S-217 99
- Q&A No.: QAH8S-218 100
- Category: TPU 100
- Q&A No.: QAH8S-219 101
- Subject: Cascaded Connection 101
- Q&A No.: QAH8S-220 102
- Q&A No.: QAH8S-221 103
- Q&A No.: QAH8S-222 104
- Q&A No.: QAH8S-223 105
- Subject: Two-Phase PWM Output 105
- Applicable Products 106
- Q&A No.: QAH8S-224 107
- Category: WDT 107
- Q&A No.: QAH8S-225 108
- Category: SCI 108
- Subject: SCI Initialization 108
- Q&A No.: QAH8S-226 109
- Q&A No.: QAH8S-227 110
- Q&A No.: QAH8S-228 111
- Q&A No.: QAH8S-229 112
- Q&A No.: QAH8S-230 113
- Q&A No.: QAH8S-231 114
- Q&A No.: QAH8S-232 117
- Q&A No.: QAH8S-233 118
- Subject: RDRF Flag Set Timing 118
- In Synchronous Mode 120
- Q&A No.: QAH8S-234 121
- Q&A No.: QAH8S-235 122
- External Clock 122
- Q&A No.: QAH8S-236 123
- Q&A No.: QAH8S-237 124
- Q&A No.: QAH8S-238 125
- Q&A No.: QAH8S-239 126
- Q&A No.: QAH8S-240 129
- Subject: Data Transfer to TDR 129
- Q&A No.: QAH8S-241 131
- Subject: TDRE Flag Set Timing 131
- 2. Synchronous mode 134
- Q&A No.: QAH8S-242 135
- Q&A No.: QAH8S-243 136
- Category: A/D Converter 136
- Q&A No.: QAH8S-244 138
- Q&A No.: QAH8S-245 140
- Q&A No.: QAH8S-246 142
- Category: I/O Ports 142
- Q&A No.: QAH8S-247 143
- Subject: Reserved Bits 143
- Q&A No.: QAH8S-248 144
- Subject: Disabling 144
- Q&A No.: QAH8S-249 145
- Q&A No.: QAH8S-250 146
- Q&A No.: QAH8S-251 147
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