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參數(shù)資料
| 型號(hào)： | M37920F8CGP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁(yè)數(shù)： | 17/155頁(yè) |
| 文件大?。?/td> | 1274K |
| 代理商： | M37920F8CGP |
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113
M37920F8CGP, M37920F8CHP, M37920FCCGP
M37920FCCHP, M37920FGCGP, M37920FGCHP
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
MITSUBISHI MICROCOMPUTERS
CLOCK GENERATING CIRCUIT
In the clock generating circuit, the basic clock which is used to oper-
ate the CPU and each internal peripheral device is made by a clock
input from pin XIN. Figure 111 shows the block diagram of the clock
generating circuit. The clock which is input from the external clock in-
put pin, XIN, generates the following;
φ, which is used to operate the microcomputer
φBIU, which is used to operate the BIU
φCPU, which is used to operate the CPU
φ is stopped only when the external clock input is disabled by STP
instruction.
φBIU is stopped when to STP or WIT instruction is ex-
ecuted. Also,
φCPU is stopped when STP or WIT instruction is ex-
ecuted or when a CPU wait request is issued by the BIU.
f1(
φ) is the basic clock for internal peripheral devices. This basic clock
is divided furthermore in the divide circuit, as shown in Figure 111,
and some frequency types are generated. Serial I/O communication
and timer B can use any of four clocks (f2, f16, f64, f512), respectively.
Timer A can use any of six clocks (f2, f16, f64, f512, and f1(
φ) and f4096).
“f2” indicates that this clock is f1(
φ) divided by 2. For operation of the
watchdog timer, refer to section on the watchdog timer.
When the STP instruction is executed,
φ, φBIU, and φCPU stop at the
“L” state.
The STP mode is terminated by acceptance of an interrupt, and the
oscillation is started. Simultaneously, supply of
φ is started.
When the watchdog timer starts to count down with Wf32 and the
most significant bit of the watchdog timer is cleared to “0”, supply of
φBIU and φCPU is restarted. The count source of the watchdog timer
is back to the count source which was selected before execution of
the STP instruction, and the generated interrupt request is accepted.
When the WIT instruction is executed,
φBIU and φCPU stops at the “L”
state. However,
φ is not stopped. Immediately after the interrupt re-
quest is accepted,
φBIU and φCPU start their operations.
In order to terminate the STP or WIT mode by a non-maskable inter-
rupt, it is necessary to make the interrupt request acceptable before
execution of the STP or WIT instruction. For setting method, refer to
the section on interrupts.
Figure 109 shows a circuit example with an external ceramic reson-
ator or a quartz crystal oscillator. The constants such as capacitance
etc. depend on a resonator. Therefore, for these constants, adopt the
oscillator/resonator manufacturer’s recommended values. Figure
110 shows a circuit e example with an external clock source.
Fig. 109 Circuit example with external ceramic resonator or quartz crystal oscillator
Fig. 110 Circuit example with external clock source
XIN
Rf
XOUT
Rd
CIN
COUT
XIN
XOUT
Left open.
External oscillation circuit
Vcc
Vss
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M38039MFL-XXXHP | 8-BIT, MROM, 16.8 MHz, MICROCONTROLLER, PQFP64 |
| M38039MFL-XXXSP | 8-BIT, MROM, 16.8 MHz, MICROCONTROLLER, PDIP64 |
| M38039MFL-XXXWG | 8-BIT, MROM, 16.8 MHz, MICROCONTROLLER, PBGA64 |
| M38039FFLHP | 8-BIT, FLASH, 16.8 MHz, MICROCONTROLLER, PQFP64 |
| M38039FFLWG | 8-BIT, FLASH, 16.8 MHz, MICROCONTROLLER, PBGA64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37920FCCGP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920FCCHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920FGCGP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920FGCHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920S4CGP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16 BIT CMOS MICROCOMPUTER |
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