M16C6S_09 Datasheet, PDF (43/208 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6S Group
Clock Generation Circuit
Table 1.7.6. Allowed Transition and Setting
High-speed mode,
middle-speed mode
State after transition
High-speed mode, On-chip Oscillator
middle-speed mode mode
Stop mode
See Table A
(7)
(8)¹
On-chip Oscillator mode
(6)² _{See Table A}
(8)¹
Stop mode
(10)³
(10)³
Wait mode
(10)
(10)
--
Wait mode
(9)
(9)
--
--: Cannot transit
Table 1. State Transition with Main Clock Division Ration in High- or Middle-speed Mode
and On-chip Oscillator Mode.
State after transition
No division
Divided by 2
No
division
(1)
Divided
by 2
(2)
Divided
by 4
(3)
(3)
Divided Divided
by 8 by 16
(5) (4)
(5) (4)
Divided by 4 (1)
(2)
(5) (4)
Divided by 8 (1)
(2) (3)
(4)
Divided by 16 (1)
(2) (3)
(5)
Table B. Setting and Operation
Setting
Operation
(1)
CM06 = 0,
CM17 = 0 , CM16 = 0
CPU clock no division mode
(2)
CM06 = 0,
CM17 = 0 , CM16 = 1
CPU clock division by 2 mode
(3)
CM06 = 0,
CM17 = 1 , CM16 = 0
CPU clock division by 4 mode
(4)
CM06 = 0,
CM17 = 1 , CM16 = 1
CPU clock division by 16 mode
(5)
CM06 = 1
CPU clock division by 8 mode
Notes:
(6)
1. Avoid making a transition when the CM21 bit is set to “1” (oscillation stop, re-oscillation detection function enabled).
Set the CM21 bit to “0” (oscillation stop, re-oscillation detection function disabled) before transiting.
(7)
2. Set the CM06 bit to “1” (division by 8 mode) before transiting from On-chip Oscillator mode to high- or middle-speed mode.
3. When exiting stop mode, the CM06 bit is set to “1” (division by 8 mode).
(8)
(9)
CM21 = 0
CM21 = 1
CM10 = 1
wait
Main clock
On-chip Oscillator clock selected
Transition to stop mode
Transition to wait mode
(10) Hardware interrupt Exit stop mode or wait mode
Rev.5.01 Dec 10, 2009 page 43 of 201
REJ03B0014-0501