Oscillation Operation; Notes On Use; Fig. 2.10.2 Structure Of Clock Control Circuit - Renesas 4513 User Manual

APPLICATION
2.10 Oscillation circuit

2.10.2 Oscillation operation

System clock is supplied to CPU and peripheral device as the standard clock for the microcomputer
operation. For the 4513/4514 Group, the clock (f(X
circuit is selected with the register MR.
Figure 2.10.2 shows the structure of the clock control circuit.
Oscillation
X
IN
circuit
X
OUT
POF instruction R
S
Note: The wait time control circuit is used to generate the time required to stabilize the f(X

Fig. 2.10.2 Structure of clock control circuit

2.10.3 Notes on use

(1) Value of a part connected to an oscillator
Values of a capacitor and a resistor of the oscillation circuit depend on the connected oscillator and
the board. Accordingly, consult the oscillator manufacturer for values of each part connected the
oscillator.
2-64
MR
3
Division circuit
1
(divided by 2)
0
Q
4513/4514 Group User's Manual
)), (f(X )/2) which is supplied from the oscillation
IN IN
System clock
Internal clock
generation circuit
Instruction clock
(divided by 3)
Wait time (Note)
control circuit
RESET
Key-on wake up control register
K0 ,K0
0
Multi-
Falling detected
plexer
I1
2
0
1
"H" level
I2
2
"L" level
0
1
"H" level
Counter
Software
start signal
,K0 ,K0
1 2 3
Ports P0 , P0
0 1
Ports P0 , P0
2 3
Ports P1 , P1
0 1
Ports P1 , P1
2 3
P3 /INT0
0
P3 /INT1
1
) oscillation.
IN