參數(shù)資料
型號(hào): M37902FCCHP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 26 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件頁(yè)數(shù): 135/143頁(yè)
文件大?。?/td> 1148K
代理商: M37902FCCHP
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91
M37902FCCHP, M37902FGCHP, M37902FJCHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
OSCILLATION CIRCUIT
An oscillation circuit locates between pins XIN and XOUT, and Figure
95 shows a circuit example with a oscillator (an external ceramic
resonator or quartz crystal oscillator). The constants such as capaci-
tance etc. depend on a oscillator. Therefore, for these constants,
adopt the oscillator manufacturer’s recommended values.
Figure 96 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 100.) is set to “1”, the
oscillation circuit stops it’s operation, and the current dissipation is
reduced. Moreover, this bit has another function, which selects the
return 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 as PLL circuit.) is included, also. This PLL
circuit uses an clock input from pin XIN and generates a multiplied
clock. When using the PLL circuit, be sure to connect pin VCONT with
an external filter circuit. (See Figure 97.) 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; See Figure 99.),
so that the PLL circuit will stop it’s operation.
Fig. 95 Circuit example with external ceramic resonator or quartz crystal oscillator
Fig. 96 Circuit example with external clock source
Fig. 97 Circuit example with pin VCONT and PLL circuit
XIN
Rf
XOUT
Rd
CIN
COUT
M37902
XIN
XOUT
Left open.
External clock source
Vcc
Vss
M37902
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 95 and 96.
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