Renesas 4514 User Manual
APPLICATION
2-63
4513/4514 Group User’s Manual
2.10 Oscillation circuit
2.10 Oscillation circuit
The 4513/4514 Group has an internal oscillation circuit to produce the clock required for microcomputer
operation.
The clock signal f(X
operation.
The clock signal f(X
IN
) is obtained by connecting a ceramic resonator to X
IN
pin and X
OUT
pin.
2.10.1 Oscillation circuit
(1)
f(X
IN
) clock generating circuit
The clock signal f(X
IN
) is obtained by connecting a ceramic resonator externally.
Connect this external circuit to pins X
IN
and X
OUT
at the shortest distance. A feed-back resistor is
built-in between X
IN
pin and X
OUT
pin.
Figure 2.10.1 shows an example of an oscillation circuit connecting a ceramic resonator externally.
Keep the maximum value of oscillation frequency within the range listed Table 2.10.1.
Keep the maximum value of oscillation frequency within the range listed Table 2.10.1.
Supply voltage
2.5 V to 5.5 V
4.0 V to 5.5 V
2.5 V to 5.5 V
2.0 V to 5.5 V (Note)
2.0 V to 5.5 V (Note)
(System clock)
(f(X
IN
)/2) Middle-speed mode
(f(X
IN
))
High-speed mode
(f(X
IN
))
High-speed mode
(f(X
IN
)/2) Middle-speed mode
(f(X
IN
))
High-speed mode
Oscillation frequency
4.2 MHz
4.2 MHz
2.0 MHz
3.0 MHz
1.5 MHz
Note: 2.5 V to 5.5 V for the One Timer PROM version.
Table 2.10.1 Maximum value of oscillation frequency and supply voltage
Fig. 2.10.1 Oscillation circuit example connecting
ceramic resonator externally
Note: Externally connect a
damping resistor Rd de-
pending on the oscilla-
tion frequency. (A feed-
back resistor is built-in.)
U s e t h e r e s o n a t o r
manufacturer’s recom-
mended value because
constants such as ca-
pacitance depend on the
resonator.
pending on the oscilla-
tion frequency. (A feed-
back resistor is built-in.)
U s e t h e r e s o n a t o r
manufacturer’s recom-
mended value because
constants such as ca-
pacitance depend on the
resonator.
4513/4514
X
IN
X
OUT
Rd
C
IN
C
OUT