M30240ECFP MITSUBISHI [Mitsubishi Electric Semiconductor], M30240ECFP Datasheet - Page 23

• Manufacturer Part Number: M30240ECFP
• Description: M30240 Group Specification
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Preliminary Specifications REV. E
Specifications in this manual are tentative and subject to change
Software Reset
Table 1.4:
2.6 Software Reset
2.7 Clock-Generating Circuit
Figure 1.11: Examples of clock source
Use of clock
Usable oscillator
Pins to connect oscillator
Oscillation stop/restart function
Oscillator status immediately after reset
When the RESET pin level = “L”, all ports change to input mode (floating.) Table 1.4 shows the status
of the other pins while the RESET pin level is “L”.
Writing a “1” to bit 3 of the processor mode register 0 (address 0004
microcomputer. A software reset has almost the same effect as a hardware reset with the following
exceptions:
• The contents of internal RAM are preserved
• All USB, DC-DC converter, and PLL SFR values are preserved. (See Section 2.4)
The clock-generating circuit contains one oscillator circuit that supplies the operating clock sources to
the CPU and internal peripheral units.Example of oscillator circuit
Figure 1.11 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. Circuit constants in Figure 1.11 vary
with each oscillator used. Use circuit constant values recommended by the oscillator manufacturer.
Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive
(Built-in feedback resistor)
X
IN
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
IN
Main clock-generating circuits
Functions
X
OUT
(Note)
R
C
d
OUT
1-23
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• CPU’s operating clock source
• Internal peripheral units’ operating clock source
Ceramic or crystal oscillator
Xin
Available
Oscillating
, Xout
Main clock-generating circuit
16
Vcc
Vss
) applies a (software) reset to the
Externally derived clock
(Built-in feedback resistor)
X
Mitsubishi microcomputers
IN
Microcomputer
M30240 Group
X
Open
OUT