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| 型號(hào)： | M34584EDFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁(yè)數(shù)： | 120/157頁(yè) |
| 文件大小： | 1130K |
| 代理商： | M34584EDFP |
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Rev.3.00
2004.08.06
page 65 of 155
REJ03B0010-0300Z
4584 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Fig. 57 External clock input circuit
Fig. 56 External quartz-crystal circuit
Note: Externally connect a damping
resistor Rd depending on the
oscillation frequency.
(A feedback resistor is built-in.)
Use the quartz-crystal manu-
facturer’s recommended value
because constants such as ca-
pacitance depend on the
resonator.
Fig. 53 Handling of XIN and XOUT when operating on-chip oscillator
Fig. 54 Ceramic resonator external circuit
Fig. 55 External RC oscillation circuit
Execute the CMCK instruc-
tion in program.
Note: Externally connect a damping
resistor Rd depending on the
oscillation frequency.
(A feedback resistor is built-in.)
Use the resonator manu-
facturer’s recommended value
because constants such as ca-
pacitance depend on the
resonator.
*
M34584
XIN
XOUT
*
Do not use the CMCK, CRCK and
CYCK instructions in program.
Open
M34584
XIN
XOUT
Rd
CIN
COUT
M34584
XIN
XOUT
R
C
*
Execute the CRCK
instruction in program.
Open
M34584
XIN
XOUT
Rd
CIN
COUT
Execute the CYCK instruction
in program.
*
M34584
XIN
XOUT
External oscillation circuit
VDD
VSS
R
1k
or more
Open
(2) On-chip oscillator operation
When the MCU operates by the on-chip oscillator as the main clock
(f(XIN)) without using the ceramic resonator, RC oscillator or
quartz-crystal oscillation, leave XIN pin and XOUT pin open (Figure
53).
The clock frequency of the on-chip oscillator depends on the sup-
ply voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
(3) Ceramic resonator
When the ceramic resonator is used as the main clock (f(XIN)),
connect the ceramic resonator and the external circuit to pins XIN
and XOUT at the shortest distance. Then, execute the CMCK in-
struction. A feedback resistor is built in between pins XIN and XOUT
(Figure 54).
(4) RC oscillation
When the RC oscillation is used as the main clock (f(XIN)), connect
the XIN pin to the external circuit of resistor R and the capacitor C
at the shortest distance and leave XOUT pin open. Then, execute
the CRCK instruction (Figure 55).
The frequency is affected by a capacitor, a resistor and a micro-
computer. So, set the constants within the range of the frequency
limits.
(5) Quartz-crystal oscillator
When a quartz-crystal oscillator is used as the main clock (f(XIN)),
connect this external circuit and a quartz-crystal oscillator to pins
XIN and XOUT at the shortest distance. Then, execute the CYCK in-
struction. A feedback resistor is built in between pins XIN and XOUT
(Figure 56).
(6) External clock
When the external clock signal for the main clock (f(XIN)) is used,
connect the clock source to XIN pin and XOUT pin open. In program,
after the CMCK instruction is executed, set main clock (f(XIN)) os-
cillation start to be enabled (MR1=0).
For this product, when RAM back-up mode and main clock (f(XIN))
stop (MR1=1), XIN pin is fixed to “H” in order to avoid the through
current by floating of internal logic. The XIN pin is fixed to “H” until
main clock (f(XIN)) oscillation starts to be valid (MR1=0) by the
CMCK instruction from reset state. Accordingly, when an external
clock is used, connect a 1 k
or more resistor to XIN pin in series
to limit of current by competitive signal.
Execute the CMCK instruction in
program, and set the main clock
f(XIN) to be enabled (MR1=0)
*
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34584MD-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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