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參數(shù)資料
| 型號： | M34556M8H-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁數(shù)： | 105/147頁 |
| 文件大?。?/td> | 1087K |
| 代理商： | M34556M8H-XXXFP |
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Rev.3.02
Dec 22, 2006
page 58 of 142
REJ03B0025-0302
4556 Group
Fig. 48 Switch to ceramic oscillation/RC oscillation
Fig. 49 Handling of XIN and XOUT when operating on-chip oscillator
Fig. 50 Ceramic resonator external circuit
Fig. 51 External RC circuit
Do not execute the CRCK in-
struction 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.
(1) On-chip oscillator operation
After system is released from reset, the MCU starts operation by
the clock output from the on-chip oscillator which is the internal os-
cillator.
The clock frequency of the on-chip oscillator depends on the supply
voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
(2) Main clock generating circuit (f(XIN))
When the MCU operates by the ceramic resonator or the RC oscil-
lator as the main clock (f(XIN)).
After system is released from reset, the ceramic oscillation is valid
for main clock.
The ceramic oscillation is invalid and the RC oscillation circuit is
valid with the CRCK instruction.
The CRCK instruction can be executed only once.
Execute the CRCK instruction in the initial setting routine (execut-
ing it in address 0 in page 0 is recommended).
When the main clock (f(XIN)) is not used, connect XIN pin to VSS
and leave XOUT pin open, and do not execute the CRCK instruction
(Figure 49).
(3) Ceramic resonator
When the ceramic resonator is used as the main clock (f(XIN)), con-
nect the ceramic resonator and the external circuit to pins XIN and
XOUT at the shortest distance. A feedback resistor is built in be-
tween pins XIN and XOUT (Figure 50). Do not execute the CRCK
instruction in program.
(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 51).
The frequency is affected by a capacitor, a resistor and a micro-
computer. So, set the constants within the range of the frequency
limits.
*
Reset
CRCK
Ceramic oscillation circuit valid
RC oscillation circuit invalid
Main clock (f(XIN))
Ceramic oscillation circuit invalid
RC oscillation circuit valid
M34556
XIN
XOUT
*
Do not use the CRCK instruction in program.
M34556
XIN
XOUT
Rd
CIN
COUT
M34556
XIN
XOUT
R
C
*
Execute the CRCK
instruction in program.
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相關(guān)代理商/技術(shù)參數(shù) |
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| M34556M8-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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