169
MC95FG308 / MC95FG208
ABOV Semiconductor Co., Ltd.
12.4 STOP Mode
The power control register is set to ‘03h’ to enter the STOP Mode. In the stop mode, the main oscillator, system clock
and peripheral clock is stopped, but watch timer continue to operate. With the clock frozen, all functions are stopped,
but the on-chip RAM and control registers are held.
The source for exit from STOP mode is hardware reset and interrupts. The reset re-defines all the control registers.
When exit from STOP mode, enough oscillation stabilization time is required to normal operation. Figure 12.3 shows
the timing diagram. When released from STOP mode, the Basic interval timer is activated on wake-up. Therefore,
before STOP instruction, user must be set its relevant prescaler divide ratio to have long enough time (more than
20msec). this guarantees that oscillator has started and stabilized.
Figure 12.3
STOP Mode Release Timing by External Interrupt
Figure 12.4
STOP Mode Release Timing by /RESET
OSC
CPU Clock
RESETB
Normal Operation
BIT Counter
STOP Mode
Normal Operation
Release
STOP Command
Clear & Start
TST = 65.5ms @ 8MHz
𝐓𝐒𝐓 =
𝟏
𝐟𝐎𝐒𝐂 ÷ 𝟐𝟎𝟒𝟖
× 𝟐𝟓𝟔
m-2
m-1
m
n
FF
0
1
1
2
FE
T
OSC
= 1/f
OSC
PRD[2:0] in BCCR = 111
B
0
64 T
OSC
OSC
CPU Clock
External
Interrupt
Normal Operation
BIT Counter
STOP Mode
Normal Operation
Release
STOP Command
Clear & Start
TST > 20ms by Software
Before executing STOP command, BCCR must be set properly
by software to get stability time is to be longer than 20ms.
n
n+1
n+2
n+3
FF
0
1
1
2
FE
T
OSC
= 1/f
OSC
PRD[2:0] in BCCR = 111
B
0
64 T
OSC
Содержание MC95FG208 Series
Страница 14: ...14 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd 4 Package Diagram Figure 4 1 32 Pin SOP Package...
Страница 15: ...15 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 2 32 Pin QFN Package...
Страница 16: ...16 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 3 32 Pin LQFP Package...
Страница 17: ...17 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 4 28 Pin SOP Package...
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Страница 19: ...19 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 6 28 Pin SOP Package...
Страница 20: ...20 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 7 28 Pin TSSOP Package...
Страница 21: ...21 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 8 20 Pin SOP Package...
Страница 22: ...22 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 9 20 Pin TSSOP Package...
Страница 23: ...23 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 10 16 Pin SOP Package...
Страница 24: ...24 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 11 16 Pin TSSOP Package...