
6.4 Operations
74
Chapter 6: Low Power Control Circuit
MB90580 Series
MCS:
MCS bit (clock selection register) (PLL clock mode is selected when MCS = 0)
SCS:
SCS bit (clock selection register) (sub-clock mode is selected when SCS = 0)
STP:
STP bit (low power consumption mode register) (sleep mode is selected when SLP = 0)
SLP:
SLP bit (low power consumption mode register) (sleep mode is selected when SLP = 0)
TMD:
TMD bit (low power consumption mode register) (watch mode is selected when TMD = 0)
MCM:
MCM bit (clock selection register) (PLL clock is in use when MCM = 0)
SCM:
SCM bit (clock selection register) (sub-clock is in use when SCM = 0)
SCD:
Sub-clock oscillation stopped (sub-clock oscillation is stopped when SCD = 1)
MCD:
Main clock oscillation stopped (main clock oscillation is stopped when MCD = 1)
PCD:
PLL clock oscillation stopped (PLL clock oscillation is stopped when PCD = 1)
Table 6.4.9a List of Transition Conditions
State before transition
Power on
Main oscillation stabili-
zation
Transition conditions
State after transition
Main mode
01 Main oscillation stabilization waiting period completed
05 Main oscillation stabilization waiting period completed
Main mode
Main mode
06 SCS = 0 written
07 SCS = 1
MCS = 0 written
31 TMD = 1STP = 0SLP = 1 written
32 TMD = 0 written
33 TMD = 1STP = 1 written
21 SCS = 0 written
20 SCS = 1MCS = 1 written
59 TMD = 1STP = 0SLP = 1 written
58 TMD = 0 written
57 TMD = 1STP = 1 written
10 SCS = 1MCS = 1 written
12 SCS = 1MCS = 0 written
MS transition mode
MP transition mode
Main sleep
Main watch transition
Main stop
PS transition mode
PM transition mode
PLL sleep
PLL watch transition P
Pseudo-watch transition
SM transition mode
SP transition mode
Main oscillation stabiliza-
tion
Sub-sleep
Sub-watch
Sub-stop
Main mode
PM transition sleep
PLL mode
Sub mode
11 Reset initiated
42 TMD = 1STP = 0SLP = 1 written
43 TMD = 0 written
44 TMD = 1STP = 1 written
13 PLL
→
main switching timing wait completed
38 TMD = 1STP = 0SLP = 1 written
39 TMD = 0 written and PLL
→
main switching timing wait
completed
40 TMD = 1 and STP = 1 written and PLL
→
main switch-
ing timing wait completed
PM transition mode
Main watch transition
Main stop