參數(shù)資料
型號(hào)： M37481E8T
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 42/97頁(yè)
文件大?。?/td> 1076K
代理商： M37481E8T
MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
42
PRELIMINARY
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 X
IN
and X
OUT
. 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 X
IN
and X
OUT
pins, so an external
resistor can be omitted.
G
Frequency Control
(1) High-speed Mode
The frequency applied to the clock input pin X
IN
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 X
IN
divided by 8 is
used as the internal clock
φ
.
G
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
“FF
16
,” and f(X
IN
)/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
X
IN
X
OUT
C
OUT
C
IN
R
d
X
IN
X
OUT
Open
External oscillation
circuit
V
CC
V
SS
Duty ratio 50%
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37481E8T-XXXFP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
M37481E8T-XXXSP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37481E8-XXXFP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
M37481E8-XXXSP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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