4-6
MSM66591/ML66592 User's Manual
Chapter 4 CPU Control Functions
4.2
Reset Function
The MSM66591/ML66592 become reset status by the following four factors:
•
RES
pin input becomes "L" level
• BRK (break) instruction is executed
• WDT overflow is generated
• OPTRP (operation code trap) is generated
The processing of these four factors is the same except for the vector address that is
loaded to the program counter during the reset process.
In the reset process, the arithmetic register, control register, mode register, etc. are
initialized, and the content of the address shown by the vector address is loaded to
the program counter.
For the initialization status of registers, see Table 3-3 SFRs. For the correspondence
between each factor and the vector address, see Table 3-1 Vector Table List.
In the case of reset by
RES
pin input, apply "L" level until more than 1 ms has elapsed
after the original oscillation clock is stable.
The reset process has priority over all other processes (interrupt process, instruction
execution). Since all other processes are suspended, the content of registers and RAM
at this time are not guaranteed.
Figure 4-3 shows the reset pin connection example. Table 4-2 shows the output pin
status at reset.
On power up, apply "L" level to the
RES
pin for 12 ms or more after V
DD
has reached
4.5 V or more.
Figure 4-2 STOP Mode Timing (when cleared by an interrupt)
Basic Clock
(CLK)
M1S1
SBYCON.STP
Interrupt Request
Operating
State
Instruction
execution
Dummy
cycle
Oscillation
stop
Oscillation
stable
time*
Dummy cycle
Instruction
execution
STOP mode
* Oscillation stable time is the sum of the time until the original oscillation clock starts oscillation,
plus the time set by OST0 and OST1 as the number of clock cycles.
Timer operating
Port output mode
Timer stop
Timer operating
Port output
Port floating (FLT = "1")
Содержание MSM66591
Страница 1: ...MSM66591 ML66592 User s Manual CMOS 16 bit microcontroller FEUL66591 66592 01 Issue Date Mar 4 2002...
Страница 15: ...Contents 12...
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Страница 18: ...Overview Chapter 1 1...
Страница 19: ......
Страница 30: ...Description of Pins Chapter 2 2...
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Страница 44: ...CPU Architecture Chapter 3 3...
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Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture...
Страница 102: ...CPU Control Functions Chapter 4 4...
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Страница 112: ...Memory Control Functions Chapter 5 5...
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Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions...
Страница 118: ...Port Functions Chapter 6 6...
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Страница 152: ...Output Pin Control Pin OE Chapter 7 7...
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Страница 156: ...Clock Generation Circuit Chapter 8 8...
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Страница 160: ...Time Base Counter TBC Chapter 9 9...
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Страница 164: ...Watchdog Timer WDT Chapter 10 10...
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Страница 224: ...PWM Functions Chapter 13 13...
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Страница 264: ...Serial Port Functions Chapter 15 15...
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Страница 348: ...A D Converter Functions Chapter 16 16...
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Страница 382: ...Transition Detector Functions Chapter 17 17...
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Страница 388: ...Peripheral Functions Chapter 18 18...
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Страница 392: ...External Interrupt Request Function Chapter 19 19...
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Страница 396: ...Interrupt Request Processing Function Chapter 20 20...
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Страница 414: ...Expansion Port Chapter 22 22...
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Страница 432: ...RAM Monitor Function Chapter 24 24...
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Страница 442: ...25 Electrical Characteristics Chapter 25...
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