Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Power Control
324
(2) Switching the driving capacity of the oscillation circuit
Both the main clock and the secondary clock have the ability to switch the driving capacity. Reducing
the driving capacity after the oscillation stabilizes allows for further reduction in power consumption.
(3) Clearing stop mode and wait mode
The stop mode and wait mode can be cleared by generating an interrupt request, or by resetting
hardware. Set the priority level of the interrupt to be used for clearing, higher than the processor
interrupt priority level (IPL), and enable the interrupt enable flag (I flag). When an interrupt clears a
mode, that interrupt is processed. Table 2.11.1 shows the interrupts that can be used for clearing a
stop mode and wait mode.
(4) BCLK in returning from wait mode or stop mode
(a) Returning from wait mode
The processor immediately returns to the BCLK, which was in use before entering wait mode.
(b) Returning from stop mode
If operation was performed in the high speed mode or medium speed mode prior to engaging the
stop mode, CM06 will change to “1” when operation shifts to the stop mode. CM17, CM16 and CM07
do not change. Accordingly, when operation is restored from the stop mode, operation starts in the 8
division mode.
Also, if operation was performed in the low speed mode prior to engaging the stop mode, CM06,
CM17, CM16 and CM07 do not change. When operation is restored from the stop mode, operation
starts in the low speed mode.
Table 2.11.1. Interrupts available for clearing stop mode and wait mode
Can be used when an external clock in clock synchronous serial I/O mode is selected.
Can be used when the external signal is being counted in event counter mode.
Can be used in one-shot mode and one-shot sweep mode.
When the MCU running in low-speed or low power dissipation mode, do not enter WAIT
mode with CM02 set to 1.
Note 1:
Note 2:
Note 3:
Note 4:
CM02 = 0
Possible
Note 3
Possible
Key input interrupt
A-D interrupt
UART0 transmit interrupt
UART0 receive interrupt
UART1 transmit interrupt
UART1 receive interrupt
Timer A0 interrupt
Timer B0 interrupt
Timer B1 interrupt
Timer X0 interrupt
Timer X1 interrupt
Timer X2 interrupt
INT0 interrupt
INT1 interrupt
Wait mode
Interrupt for clearing
Possible
Impossible
Note 1
Impossible
Note 2
Possible
Stop mode
CM02 = 1(Note 4), CM07=0, CM05=0
Possible
Impossible
Note 1
Impossible
Note 2
Possible