M30622 Mitsubishi, M30622 Datasheet - Page 40

• Manufacturer Part Number: M30622
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: Mitsubishi

Clock Generating Circuit
Clock Generating Circuit
Example of oscillator circuit
Table 1.13.1. Main clock and sub clock generating circuits
Figure 1.13.1. Examples of main clock
Figure 1.13.2. Examples of sub clock
The clock generating circuit contains two oscillator circuits that supply the operating clock sources to the
CPU and internal peripheral units.
Use of clock
Usable oscillator
Pins to connect oscillator
Oscillation stop/restart function
Oscillator status immediately after reset
Other
Figure 1.13.1 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 1.13.2 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 1.13.1 and 1.13.2 vary with each oscillator used. Use
the values recommended by the manufacturer of your oscillator.
Tentative Specifications REV.A
S
pecifications in this manual are tentative and subject to change.
Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive
Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive
X
(Built-in feedback resistor)
X
(Built-in feedback resistor)
CIN
IN
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.
Microcomputer
Microcomputer
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.
C
C
IN
CIN
X
COUT
X
OUT
(Note)
R
(Note)
R
C
C
Cd
d
OUT
COUT
• CPU’s operating clock source
• Internal peripheral units’
Ceramic or crystal oscillator
X
Available
Oscillating
Externally derived clock can be input
operating clock source
IN
Main clock generating circuit
, X
OUT
40
Vcc
Vss
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Vcc
Vss
Externally derived clock
(Built-in feedback resistor)
X
(Built-in feedback resistor)
Externally derived clock
X
IN
• CPU’s operating clock source
• Timer A/B’s count clock
Crystal oscillator
X
Available
Stopped
CIN
Microcomputer
CIN
Microcomputer
Sub clock generating circuit
source
, X
COUT
Mitsubishi microcomputers
X
Open
X
Open
OUT
COUT
M16C / 62T Group