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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： | 57/77页 |
| 文件大小： | 2650K |
| 代理商： | M306V8FJFP |
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M306V8FJFP
Rev.1.31
Apr 18, 2005
page 58 of 363
REJ03B0082-0131
Microcomputer
(Built-in feedback resistor)
XCIN
XCOUT
Externally derived clock
Open
Vss
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 XCIN
and XCOUT following the instruction.
Microcomputer
(Built-in feedback resistor)
XCIN
XCOUT
(Note)
CCIN
CCOUT
RCd
VCC
Figure 5.8. Examples of Sub Clock Connection Circuit
(2) Sub Clock
The sub clock is generated by the sub clock oscillation circuit. This clock is used as the clock source for
the CPU clock, as well as the timer A and timer B count sources. In addition, an fc clock with the same
frequency as that of the sub clock can be output from the CLKOUT pin.
The sub clock oscillator circuit is configured by connecting a crystal resonator between the XCIN and
XCOUT pins. The sub 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 sub
clock oscillator circuit may also be configured by feeding an externally generated clock to the XCIN pin.
Figure 5.8 shows the examples of sub clock connection circuit.
After reset, the sub clock is turned off. At this time, the feedback resistor is disconnected from the oscilla-
tor circuit.
To use the sub clock for the CPU clock, set the CM07 bit of CM0 register to “1 ” (sub clock) after the sub
clock becomes oscillating stably.
OSD Oscillation Circuit
The OSD clock oscillation circuit can be chosen to be an external oscillator circuit comprised of an LC
oscillator or a ceramic resonator (or a quartz-crystal oscillator) connected between the OSC1 and OSC2
pins, or an internal oscillator circuit with a filter connected to the OSC1 pin. Which of LC oscillator or a
ceramic resonator (or a quartz-crystal oscillator) is selected by setting bits 0, 1 and 2 of the clock control
register (address 020516) and bit 1 of the extended register 1C (address 02DC16).
Figure 5.9. OSD clock connection example
OSC2
OSC1
L
C1
C2
Microcomputer
OSC2
OSC1
1K
0.015F
2pF
Microcomputer
OPEN
Connecting an external oscillator circuit
Connecting an internal oscillator circuit
Note: When mounting a resistor and capacitors,
use the shortest possible wiring to prevent leakage.
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