參數(shù)資料
型號: M34551E8-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, MICROCONTROLLER, PQFP48
封裝: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數(shù): 33/154頁
文件大?。?/td> 1778K
代理商: M34551E8-XXXFP
APPLICATION
2-51
4551 Group User’s Manual
2.8 Oscillation circuit
2.8.2 Oscillation operation
System clock is supplied to CPU and peripheral device as the standard clock for the microcomputer
operation. For the 4551 Group, the clock (f(XIN)), (f(XIN)/4), (f(XCIN)), or (f(XCIN))/4 which is supplied from
the oscillation circuit is selected with the register MR.
Figure 2.8.3 shows the structure of the clock control circuit.
Fig. 2.8.3 Structure of clock control circuit
2.8.3 Notes on use
(1)
Value of a part connected to an oscillator
Values of a capacitor and a resistor of the oscillation circuit depend on the connected oscillator and
the board. Accordingly, consult the oscillator manufacturer for values of each part connected the
oscillator.
OSC
XIN
XOUT
OSC
XCIN
XCOUT
Internal clock
generating circuit
(divided by 3)
MR0
R
S
Q
R
S
Q
POF instruction
POF2 instruction
MR1
T2F flag
Falling detected
Ports P0, P1
RESET
Multiplexer
Frequency
dividing
circuit
(divided by 4)
MR3
0
1
STCK
INSTCK
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