M16C26A Datasheet, PDF (56/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/26A Group (M16C/26A, M16C/26B, M16C/26T)
7. Clock Generation Circuit
Sub-clock
generating circuit
XCIN
XCOUT
CM04
CM21
CM10=1(stop mode)
WAIT instruction
SQ
R
XIN
XOUT
Main
clock
Main clock
generating circuit
CM05
SQ
R
RESET
Software reset
NMI
Interrupt request level judgment output
CM00, CM01, CM02, CM04, CM05, CM06, CM07: CM0 register bits
CM10, CM11, CM16, CM17: CM1 register bits
PCLK0, PCLK1, PCLK5: PCLKR register bits
CM21, CM27 : CM2 register bits
I/O ports
PCLK5=0,CM01-CM00=002
PCLK5=0,CM01-CM00=012
PCLK5=1,
CM01-CM00=002
PCLK5=0,
CM01-CM00=102
1/32
fC32
Sub-clock
fC
On-chip
oscillator
clock
f1 PCLK0=1
f2
PCLK0=0
f8
f32
fAD
CLKOUT
PCLK5=0,
CM01-CM00=112
Oscillation
stop, re-
oscillation
detection
circuit
PLL
frequency
synthesizer
PLL
1 ^clock
CM21=1
eb c
a
f1SIO
f2SIO
PCLK1=1
PCLK1=0
f8SIO
f32SIO
d
CM07=0
D4INT clock
CPU clock
0
CM11
CM21=0
fC
CM07=1
BCLK
CM02
e
b
c
a
1/2
1/2
1/2
1/2
1/2
1/32
1/2
1/4
1/8
1/16
CM06=1
CM06=0
CM17-CM16=10 2
CM06=0
CM17-CM16=11 2
d
CM06=0
CM17-CM16=01 2
CM06=0
CM17-CM16=00 2
Details of divider
Oscillation stop, re-oscillation detection circuit
On-chip Oscillator
Main
clock
Pulse generation
circuit for clock
edge detection
and charge,
discharge control
Charge,
discharge
circuit
CM27=0
CM27=1
Reset
generating
circuit
Oscillation stop
detection reset
Oscillation stop,
re-oscillation
detection interrupt
generating circuit
Oscillation stop,
re-oscillation
detection signal
CM21 switch signal
f1(ROC)
ROCR1-ROCR0=002
f2(ROC)
ROCR1-ROCR0=012
f3(ROC)
ROCR1-ROCR0=112
1/2
1/2
1/2
1/2
1/4
1/8
ROCR3-ROCR2=112
ROCR3-ROCR2=102
ROCR3-ROCR2=012
On-chip
oscillator
clock
PLL frequency synthesizer
Main clock
Programmable
counter
Phase
comparator
Figure 7.1. Clock Generation Circuit
Charge
pump
Voltage
1/2
control
oscillator
(VCO)
Internal low-
pass filter
PLL clock
Rev. 2.00 Feb.15, 2007 ^{page 39} of 329
REJ09B0202-0200