M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 71
M30280F6HP
Manufacturer Part Number
M30280F6HP
Description
16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.M30280F6HP.pdf
(423 pages)
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M
R
R
7.1 Main Clock
e
E
1
. v
Figure 7.8 Examples of Main Clock Connection Circuit
J
6
0
The following describes the clocks generated by the clock generation circuit.
The main clock is generated by the main clock oscillation circuit. This clock is used as the clock source for
the CPU and peripheral function clocks. The main clock oscillator circuit is configured by connecting a
resonator between the X
which is disconnected from the oscillator circuit during stop mode in order to reduce the amount of power
consumed in the chip. The main clock oscillator circuit may also be configured by feeding an externally
generated clock to the X
The main clock oscillates after reset. The power consumption in the chip can be reduced by setting the
CM05 bit in the CM0 register to “1” (main clock oscillator circuit turned off) after switching the clock source
for the CPU clock to a sub clock or on-chip oscillator clock. In this case, X
because the internal feedback resistor remains on, X
During stop mode, all clocks including the main clock are turned off. Refer to 7.6 power control.
If the main clock is not used, it is recommended to connect the XIN pin to VCC to reduce power consump-
tion during reset.
C
2
9
0 .
2 /
B
0
0
8
0
4
G
J
7
a
o r
0 -
. n
(Built-in Feedback Resistor)
u
2
3
p
0
, 1
0
(
M
Microcomputer
2
0
NOTE:
1
0
6
7
1. Insert a damping resistor if required. Resistance value varies depending on the oscillator setting.
2. The external clock should not be stopped when it is connected to the X
C
Use resistance value recommended by the oscillator manufacturer. If the oscillator manufacturer
recommends that a feedback resistor be added to the chip externally, insert a feedback resistor
between X
selected as the CPU clock.
2 /
X
, 8
V
OUT
page 51
X
SS
IN
M
IN
IN
1
pin. Figure 7.8 shows the examples of main clock connection circuit.
6
IN
and X
Oscillator
C
and X
Rd
f o
2 /
(1)
8
3
) B
OUT
8
OUT
5
.
pins. The main clock oscillator circuit contains a feedback resistor,
C
C
OUT
IN
(Built-in Feedback Resistor)
IN
Microcomputer
is pulled “H” to X
X
OUT
X
IN
Open
V
V
CC
SS
IN
External Clock
pin and the main clock is
OUT
via the feedback resistor.
OUT
7. Clock Generation Circuit
goes “H”. Furthermore,
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