19. Power down operation
A96G150 User's manual
268
19.3
STOP mode
Power control register is set to ‘03H’ to enter into STOP mode. In STOP mode, the selected oscillator,
system clock and peripheral clock is stopped, but watch timer can be continued to operate with sub
clock.
With the clock frozen, all functions are stopped, but the on-chip RAM and control registers are held. For
example, If the internal RC oscillator (f
IRC
) is selected for the system clock and the sub clock (f
SUB
) is
oscillated, the internal RC oscillator stops oscillation and the sub clock is continuously oscillated in stop
mode. At that time, the watch timer can be operated with the sub clock.
Sources to exit from STOP mode is hardware reset and interrupts. The hardware reset re-defines all
control registers. When awaking from STOP mode, enough oscillation stabilization time is required to
normal operation. Figure 118 shows the timing diagram.
As shown in the Figure 118, when released from STOP mode, the basic interval timer is activated on
wake-up. Therefore, before STOP instruction, a user must set relevant prescale divide ratio to have
long enough time. This guarantees that an oscillator has started and stabilized.
Figure 118. STOP Mode Release Timing by External Interrupt
OSC
CPU Clock
External
Interrupt
Normal Operation
BIT Counter
STOP Operation
Normal Operation
Release
STOP Instruction
Execute
Clear & Start
By Software setting
Before executed STOP instruction, BIT must be set properly
by software to get stabilization.
n
n+1
n+2
n+3
FF
0
1
1
2
FE
0
Содержание A96G150
Страница 126: ...12 Timer 0 1 2 3 4 5 A96G150 User s manual 126 Figure 43 16 bit Timer Counter Mode Operation Example...
Страница 136: ...12 Timer 0 1 2 3 4 5 A96G150 User s manual 136 Figure 51 16 bit Timer Counter Mode Operation Example...
Страница 147: ...A96G150 User s manual 12 Timer 0 1 2 3 4 5 147 Figure 59 16 bit Timer Counter Mode Operation Example...
Страница 157: ...A96G150 User s manual 12 Timer 0 1 2 3 4 5 157 Figure 67 16 bit Timer Counter Mode Operation Example...
Страница 171: ...A96G150 User s manual 14 12 bit ADC 171 Figure 79 ADC Operation Flow Sequence...
Страница 333: ...A96G150 User s manual Revision history 333 Revision history Revision Date Notes 1 00 2022 06 22 First creation...