Renesas M16C Series User Manual page 288

M30245 Group
System clock control register 0 (Note 1)
b7
w w w . D a t a S h e e t 4 U . c o m
System clock control register 1 (Note 1)
b7
Figure 2.16.4. Power control-related registers
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
b6 b5 b4 b3 b2 b1 b0
0 0
Bit Symbol
Reserved bit
CM02
CM03
CM04
CM05
CM06
CM07
Note 1: Set bit 0 of the protect register (address 000A
Note 2: Changes to "1" when changing to stop mode and at a reset.
Note 3: When entering power saving mode, main clock stops using this bit. When returning from
Note 4: When inputting external clock, only clock oscillation buffer is stopped and clock input is
Note 5: If this bit is set to "1", X
Note 6: Set port Xc select bit (CM04) to "1", and stabilize the sub clock oscillating before setting to
Note 7: This bit changes to "1", when changing from high-speed/medium mode to stop mode and at
Note 8: f
Note 9: When the X
b6 b5 b4 b3 b2 b1 b0
0 0 0
0
Bit Symbol
CM10
Reserved bit
CM15
CM16
CM17
Note 1: Set bit 0 of the protect register (address 000A
Note 2: This bit changes to "1", when changing from high-speed/medium mode to stop mode and at
reset. When shifting from low-speed/low power dissipation mode to stop mode, the value
Note 3: Can be selected when bit 6 of the system clock control register 0 (address 0006
If "1", division mode is fixed at 8.
Note 4: If this bit is set to "1", X
X
page 279 of 354
Symbol Address
CM0 0006
16
Bit Name
WAIT peripheral function
clock stop bit
Xcin-Xcout drive capacity
select bit (Note 2)
Port Xc select bit
Main clock (Xin-Xout)
stop bit (Note 3, 4, 5)
Main clock division select
bit 0 (Note 7)
System clock select bit
(Note 6)
stop mode and operating in X , set this bit to "0". When main clock oscillation is operating
IN
by itself, set system clock select bit (CM07) to "1" before setting this bit to "1".
acceptable.
becomes "H". The built-in feedback resistor remains connected,
OUT
so X becomes pulled up to Xout ("H") using the feedback resistor.
IN
this bit from "0" to "1". Do not write to both bits at the same time. Also, set the main clock
stop bit (CM05) to "0", and stabilize the main clock oscillating before setting this bit from
"1" to "0".
reset. When shifting from low-speed/low power dissipation mode to stop mode, the value
before stop mode is retained.
is not included. Do not set to "1" when using low-speed or low power dissipation mode.
C32
/X is used, set ports P8
CIN COUT
Symbol Address
CM1 0007
16
Bit Name
All clock stop control bit
(Note 4)
Xin-Xout drive capacity
select bit (Note 2)
Main clock division select
bit 1 (Note 3)
before stop mode is retained.
turns "H", and the built-in feedback resistor is cut off. X
OUT
turn high-impedance state.
COUT
When reset
48
16
Function R W
O O
Always set to "0"
0 : Do not stop in wait mode
O O
1 : Stop in wait mode (Note 8)
0 : LOW
O O
1 : HIGH
0 : I/O port
O O
1 : Xcin-Xcout generation
0 : On
O O
1 : Off
0 : CM16 and CM17 valid
O O
1 : Divide-by-8 mode
0 : Xin, Xout
O O
1 : Xcin, Xcout
) to "1" before writing to this register.
16
and P8 as the input ports without pull-up.
7
6
When reset
20
16
Function R W
0 : Clock on
O O
1 : All clocks off (stop mode)
Always set to "0"
O O
0 : LOW
O O
1 : HIGH
b7 b6
O O
0 0 : No division mode
0 1 : Divide-by-2 mode
1 0 : Divide-by-4 mode
O O
1 1 : Divide-by-16 mode
) to "1" before writing to this register.
16
) is "0".
16
CIN
2. Power Control
and