m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 63

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

which is externally generated can be input. Oscillation circuit examples are shown below.
CLOCK GENERATING CIRCUIT
4.1 Oscillation circuit examples
4.1 Oscillation circuit examples
To the oscillation circuit, a ceramic resonator or a quartz-crystal oscillator can be connected, or the clock
4-2
4.1.1 Connection example with resonator/oscillator
Figure 4.1.1 shows an example where pins X
oscillator.
The circuit constants such as R
oscillator. These values shall be set to the values recommended by the resonator/oscillator manufacturer.
4.1.2 Externally generated clock input example
Figure 4.1.2 shows an input example of a clock which is externally generated. An external clock must be
input from pin X
When an externally generated clock is input, the power source current consumption can be saved by the
stop of internal circuit’s operation between pins X
FUNCTION.”)
IN
, and pin X
OUT
f
must be left open.
, R
d
, C
7905 Group User’s Manual Rev.1.0
IN
, and C
IN
and X
OUT
IN
and X
(shown in “Figure 4.1.1”) depend on the resonator/
OUT
Fig. 4.1.1 Connection example of resonator/oscillator
Fig. 4.1.2 Externally generated clock input example
connect across a ceramic resonator/quartz-crystal
OUT
. (Refer to “CHAPTER 16. POWER SAVING
Vcc
Vss
Externally generated clock
X
X
IN
IN
C
M37905
IN
M37905
R
f
X
Open
OUT
X
OUT
R
C
d
OUT