參數(shù)資料
型號(hào)： M37905M8C-XXXSP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDIP64
封裝： 0.750 INCH, 1.78 MM PITCH, PLASTIC, SDIP-64
文件頁(yè)數(shù)： 84/103頁(yè)
文件大?。?/td> 1402K
代理商： M37905M8C-XXXSP
80
M37905M4C-XXXFP, M37905M4C-XXXSP
M37905M6C-XXXFP, M37905M6C-XXXSP
M37905M8C-XXXFP, M37905M8C-XXXSP
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Som
e param
etric
lim
its are
subject
to change.
16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
OSCILLATION CIRCUIT
An oscillation circuit locates between pins XIN and XOUT, and Figure
90 shows a circuit example with an external ceramic resonator or
quartz crystal oscillator. The constants such as capacitance etc. de-
pend on a resonator/oscillator. Therefore, for these constants, adopt
the resonator/oscillator manufacturer’s recommended values.
Figure 91 shows a circuit example with an external clock source.
When an external clock is input, be sure to leave pin XOUT open.
Also, in this case, when the external clock input select bit (bit 1 of the
particular function select register 0; See Figure 95.) is set to “1”, the
oscillation circuit stops it’s operation and resumes the current dissi-
pation. Moreover, this bit has another function, which selects the re-
turn condition from the stop mode. For details, refer to the section on
the standby function.
On the other hand, the PLL (Phase Locked Loop) frequency multi-
plier (hereafter, referred to as PLL circuit.) is included, also. This PLL
circuit uses a clock input from pin XIN and generates a multiplicated
clock. When using the PLL circuit, be sure to connect pin VCONT with
an external filter circuit. (See Figure 92.) When not using the PLL cir-
cuit, be sure to leave pin VCONT open.
When not using the PLL circuit, be sure to clear the PLL circuit op-
eration enable bit (bit 1 of the clock control register 0; See Figure
94.), so that the PLL circuit will stop its operation.
Fig. 90 Circuit example with external ceramic resonator or quartz-crystal oscillator
Fig. 91 Circuit example with external clock source
Fig. 92 Circuit example of connection with pin VCONT when PLL cir-
cuit used
XIN
Rf
XOUT
Rd
CIN
COUT
M37905
XIN
XOUT
Left open.
External clock source
Vcc
Vss
M37905
VCONT
1 k
0.1
F
220 pF
Note: Make the wiring length as short as possible,
and shield it with the GND line which
surrounds this circuit. Also, for the clock
supply to pin XIN, see Figures 90 and 91.
相關(guān)PDF資料
PDF描述
M37905M8C-XXXFP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP64
M37905M6C-XXXSP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDIP64
M37906M4H-XXXFP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDSO42
M37906M6C-XXXFP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDSO42
M37906M8C-XXXFP 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDSO42
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參數(shù)描述
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