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参数资料
| 型号： | M306V8FJFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP116 |
| 封装： | 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116 |
| 文件页数： | 55/77页 |
| 文件大小： | 2650K |
| 代理商： | M306V8FJFP |
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M306V8FJFP
Rev.1.31
Apr 18, 2005
page 57 of 363
REJ03B0082-0131
Microcomputer
(Built-in feedback resistor)
XIN
XOUT
Externally derived clock
Open
VCC
Vss
Microcomputer
(Built-in feedback resistor)
XIN
XOUT
Rd
CIN
COUT
(Note)
Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive
capacity setting. Use the value recommended by the maker of the oscillator.
When the oscillation drive capacity is set to low, check that oscillation is stable. Also, if the oscillator manufacturer's
data sheet specifies that a feedback resistor be added external to the chip, insert a feedback resistor between XIN
and XOUT following the instruction.
Figure 5.7. Examples of Main Clock Connection Circuit
The following describes the clocks generated by the clock generation circuit.
(1) Main Clock
This clock is used as the clock source for the CPU and peripheral function clocks. This clock is used as
the clock source for the CPU and peripheral function clocks. The main clock oscillator circuit is configured
by connecting a resonator between the XIN and XOUT pins. The main clock oscillator circuit contains a
feedback resistor, which is disconnected from the oscillator circuit during stop mode in order to reduce the
amount of power consumed in the chip. The main clock oscillator circuit may also be configured by
feeding an externally generated clock to the XIN pin. Figure 5.7 shows the examples of main clock con-
nection circuit.
After reset, the main clock divided by 8 is selected for the CPU clock.
The power consumption in the chip can be reduced by setting the CM05 bit of CM0 register to “1” (main
clock oscillator circuit turned off) after switching the clock source for the CPU clock to a sub clock. In this
case, XOUT goes “H”. Furthermore, because the internal feedback resistor remains on, XIN is pulled “H” to
XOUT via the feedback resistor. Note that if an externally generated clock is fed into the XIN pin, the main
clock cannot be turned off by setting the CM05 bit to “1”, unless the sub clock is chosen as a CPU clock.
If necessary, use an external circuit to turn off the clock.
During stop mode, all clocks including the main clock are turned off. Refer to “power control”.
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