M16C26 Datasheet, PDF (36/239 Pages) Renesas Technology Corp – 16-BIT CMOS SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES

Udenvdeelropment
Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative
Clock Generating Circuit
and
subject to change.
SINGLE-CHIP 16-BIT
M16C/26 Group
CMOS MICROCOMPUTER
Clock Control
Figure 1.8.3 shows the block diagram of the clock generating 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
Sub-clock
Ring
oscillator
Ring
oscillator
clock
Oscillation
stop, re-
oscillation
detection
circuit
1
1
0
0
CM20 ^CM21
CM02
fC32
1/32
f1
PCLK0=1
f2
PCLK0=0
fC
f8
f32
fAD
f1SIO
f2SIO
PCLK1=1
PCLK1=0
f8SIO
eb c
a _Divider d
f32SIO
CM07=0
fC
CM07=1
BCLK
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=102
CM06=0
CM17–CM16=112
d
CM02, CM04, CM05, CM06, CM07: CM0 register bits
CM10, CM11, CM16, CM17: CM1 register bits
PCLK0, PCLK1: PCLK register bits
CM21, CM27 : CM2 register bits
CM06=0
CM17–CM16=012
CM06=0
CM17–CM16=002
Details of divider
Figure 1.8.3. Clock generating circuit
30
Renesas Technology Corp.