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参数资料
| 型号： | M37481M8-XXXFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | 10 X 10 MM, 0.80 MM PITCH, PLASTIC, QFP-44 |
| 文件页数： | 41/100页 |
| 文件大小： | 1457K |
| 代理商： | M37481M8-XXXFP |
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MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
42
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
Clock Generating Circuit
The 7480/7481 group is provided with a built-in oscillation circuit.
An oscillation circuit can be formed by connecting a resonator be-
tween XIN and XOUT. Use the manufacturer's recommended
values for constants such as capacitance, which will differ de-
pending on each resonator. The 7480/7481 group has a built-in
feedback resistor between the XIN and XOUT pins, so an external
resistor can be omitted.
q Frequency Control
(1) High-speed Mode
The frequency applied to the clock input pin XIN divided by 2 is
used as the internal clock
φ. This mode is set after reset release.
(2) Medium-speed Mode
The frequency applied to the clock input pin XIN divided by 8 is
used as the internal clock
φ.
q Oscillation Frequency
(1) Stop Mode
If the STP instruction is executed, the internal clock
φ stops at an
“H” level, and the oscillator stops. At this time, timer 1 is set to
“FF16,” and f(XIN)/8 is forcibly connected to the count source of
timer 1. Accordingly, set the timer 1 interrupt enable bit to the dis-
able status (“0”) before execution of the STP instruction.
When a reset or an external interrupt is accepted, oscillation is re-
started, but the internal clock
φ is supplied to the CPU after timer
1 underflows. This is because when an external resonator is used,
some time is required until a start of oscillation.
(2) Wait Mode
If the WIT instruction is executed, the internal clock
φ stops at an
“H” level. But, the oscillator does not stop. When a reset or inter-
rupt is accepted, the stop status is released. The microcomputer
can execute any instruction immediately, because the oscillator
does not stop.
Fig. 44 External circuit of ceramic resonator
Fig. 45 External clock input circuit
XIN
XOUT
COUT
CIN
Rd
XIN
XOUT
External oscillation
circuit
Open
VCC
VSS
Duty ratio 50%
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37481M8-XXXSP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37481MT-088FP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481MXT | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481MXT-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481MXT-XXXSP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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