Renesas H8S/2138 Series Manuál stáhnout pdf (Strana 32)

Microcomputer Technical Q&A

Q&A No.: QAH8S-021

Category: Exception Handling

Subject: Reset

Question

A reset time of at least 20 ms is specified. Does this also apply when an external clock is used?

Answer

No, this specification does not apply in the case of an external clock. When an external clock is

used, the reset time should be at least 500 µs. A reset of at least the length of the external clock

output settling delay time (t

DEXT

= 500 µs) is necessary to allow the clock output to stabilize (see

figure below).

EXTAL

RES

DEXT

Oscillation Settling Timing

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 147 148

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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