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參數(shù)資料
| 型號： | M37702M2-127FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單片16位CMOS微機(jī) |
| 文件頁數(shù)： | 44/59頁 |
| 文件大?。?/td> | 811K |
| 代理商： | M37702M2-127FP |
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44
MITSUBISHI MICROCOMPUTERS
M37702M2AXXXFP, M37702M2BXXXFP
M37702S1AFP, M37702S1BFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
CLOCK GENERATING CIRCUIT
Figure 55 shows a block diagram of the clock generator.
When an STP instruction is executed, the internal clock
φ
stops
oscillating at “L” level. At the same time, FFF
16
is written to watch-
dog timer and the watchdog timer input connection is forced to f
32
.
This connection is broken and connected to the input determined
by the watchdog timer frequency selection flag when the most sig-
nificant bit of the watchdog timer is cleared or reset.
Oscillation resumes when an interrupt is received, but the internal
clock
φ
remains at “L” level until the most significant bit of the
watchdog timer is cleared. This is to avoid the unstable interval at
the start of oscillation when using a ceramic resonator.
When a WIT instruction is executed, the internal clock
φ
stops at
“L” level, but the oscillator does not stop. The clock is restarted
when an interrupt is received. Instructions can be executed imme-
diately because the oscillator is not stopped.
The stop or wait state is released when an interrupt is received or
when reset is issued. Therefore, interrupts must be enabled be-
fore executing a STP or WIT instruction.
Figure 56 shows a circuit example using a ceramic (or quartz crys-
tal) resonator. Use the manufacture’s recommended values for
constants such as capacitance which differ for each resonator.
Figure 57 shows an example of using an external clock signal.
Fig. 56 Circuit using a ceramic resonator
Fig. 57 External clock input circuit
Fig. 55 Block diagram of a clock generator
1M
Rd
X
IN
X
OUT
M37702M2AXXXFP
30
29
X
IN
X
OUT
Open
External clock source
Vcc
Vss
30
M37702M2AXXXFP
29
X
OUT
X
IN
Watchdog
timer
Interrupt request
WIT instruction
Q
S
R
Q
S
R
STP instruction
STP instruction
Reset
Q
S
R
Internal clock
φ
f
2
f
16
f
32
f
64
f
512
1/2
1/8
1/2
1/2
1/8
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37702S1AFP | Single Chip 16 Bits CMOS Microcomputer(16位單片機(jī)) |
| M37702S1BFP | Single Chip 16 Bits CMOS Microcomputer(16位單片機(jī)) |
| M37702M2A | Single Chip 16 Bits CMOS Microcomputer(16位單片機(jī)) |
| M37702M2B | Single Chip 16 Bits CMOS Microcomputer(16位單片機(jī)) |
| M37702M2AXXXFP | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37702M2A | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37702M2A-278FP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37702M2AXXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37702M2A-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37702M2BXXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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