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M16C/62P Group (M16C/62P, M16C/62PT)
10. Clock Generation Circuit
Rev.2.41
Jan 10, 2006
Page 83 of 390
REJ09B0185-0241
Figure 10.1
Clock Generation Circuit
fC32
CM02, CM04, CM05, CM06, CM07: Bits in CM0 register
CM10, CM11, CM16, CM17: Bits in CM1 register
PCLK0, PCLK1: Bits in PCLKR register
CM21, CM27
: Bits in CM2 register
1/32
Main clock
generating circuit
fC
CM02
CM04
CM10=1(stop mode)
Q
S
R
WAIT instruction
CM05
Q
S
R
NMI
Interrupt request level judgment output
RESET
Software reset
fC
CPU clock
CM07
=
0
CM07
=
1
Divider
a
d
1/2
1/2
1/2
1/2
CM06=0
CM17 to CM16=00b
CM06=0
CM17 to CM16=01b
CM06=0
CM17 to CM16=10b
CM06=1
CM06=0
CM17 to CM16=11b
d
a
Details of divider
Sub-clock
generating circuit
XCIN
XCOUT
XOUT
XIN
f8
f32
c
b
b
1/2
c
f32SIO
f8SIO
fAD
f1
e
e
1/2
1/4
1/8
1/16
1/32
PCLK0=1
PLL
frequency
synthesizer
0
1
CM21=1
CM11
CM21=0
On-chip
oscillator
PLL
clock
Sub-clock
On-chip
oscillator
clock
BCLK
PCLK0=0
f2
f1SIO
PCLK1=1
PCLK1=0
f2SIO
Main
clock
CLKOUT
PM01 to PM00=00b, CM01 to CM00=01b
PM01 to PM00=00b, CM01 to CM00=10b
CM01 to CM00=00b
I/O ports
PM01 to PM00=00b,
CM01 to CM00=11b
CM21
Oscillation
stop,
re-oscillation
detection
circuit
D4INT clock
Oscillation stop
detection reset
Main
clock
Oscillation Stop, Re-Oscillation Detection Circuit
Oscillation stop
detection reset
CM21 switch signal
CM27=0
CM27=1
Charge,
discharge
circuit
Reset
generating
circuit
Oscillation stop,
re-oscillation
detection interrupt
generating circuit
Pulse generation
circuit for clock
edge detection
and charge,
discharge control
Charge
pump
Voltage
control
oscillator
(VCO)
PLL Clock
Main clock
1/2
Programmable
counter
Internal lowpass
filter
PLL Frequency Synthesizer
Phase
compar
ator
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