参数资料
型号: M30201F4T-FP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 10 MHz, MICROCONTROLLER, PQFP56
封装: PLASTIC, QFP-56
文件页数: 69/158页
文件大小: 1633K
代理商: M30201F4T-FP
18
Clock Generating Circuit
Under
development
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Figure 1.16. Examples of sub-clock
Table 1.3. Main clock and sub-clock generating circuits
Clock Generating Circuit
The clock generating circuit contains two oscillator circuits that supply the operating clock sources to the
CPU and internal peripheral units.
Example of oscillator circuit
Figure 1.15 shows some examples of the main clock circuit, one using an oscillator connected to the circuit,
and the other one using an externally derived clock for input. Figure 1.16 shows some examples of sub-
clock circuits, one using an oscillator connected to the circuit, and the other one using an externally derived
clock for input. Circuit constants in Figures 15 and 16 vary with each oscillator used. Use the values
recommended by the manufacturer of your oscillator.
Figure 1.15. Examples of main clock
Main clock generating circuit
Sub clock generating circuit
Use of clock
CPU’s operating clock source
Internal peripheral units’
Timer A/B/X’s count clock
operating clock source
source
Usable oscillator
Ceramic or crystal oscillator
Crystal oscillator
Pins to connect oscillator
XIN, XOUT
XCIN, XCOUT
Oscillation stop/restart function
Available
Oscillator status immediately after reset
Oscillating
Stopped
Other
Externally derived clock can be input
M30201
(Built-in feedback resistor)
XIN
XOUT
Externally derived clock
Open
Vcc
Vss
M30201
(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.
M30201
(Built-in feedback resistor)
XCIN
XCOUT
Externally derived clock
Open
Vcc
Vss
M30201
(Built-in feedback resistor)
XCIN
XCOUT
(Note)
CCIN
CCOUT
RCd
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.
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