MC96FR116C
160
November, 2018 Rev.1.8
NOTE
The oscillation stability time is up to the characteristic of an oscillator or a resonator connected to the device.
So the 20ms of recommended stability time is not absolute.
MC96FR116C acts in a little different manner after it awakes from STOP mode according to the
external power condition after wake-up event.
In stop mode, the main oscillator is halted and any internal peripheral does not operate normally. So
only an interrupt from external world can wake the device up from STOP mode. These kinds of
interrupts are an external interrupt, key input or RXD pin in UART mode. When an interrupt is
detected, the wake-up logic enables BOD to check the external voltage level. If the voltage level is
higher than the BOD stop level(=V
BODR
), the device wakes up normally to resume program execution.
Otherwise if the checked voltage level is below the V
BODR
, it remains in STOP mode. This continues
XIN
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
XIN
= 1/f
XIN
PRD[2:0] in BCCR = 111
B
0
64 T
XIN
XIN
CPU Clock
RESETB
Normal Operation
BIT Counter
STOP Mode
Normal Operation
Release
STOP Command
Clear & Start
TST = 65.5ms @ 8MHz
𝐓𝐒𝐓
𝟏
𝐟𝐗𝐈𝐍 ÷ 𝟐𝟎𝟒𝟖
× 𝟐𝟓𝟔
m-2
m-1
m
n
FF
0
1
1
2
FE
T
XIN
= 1/f
XIN
PRD[2:0] in BCCR = 111
B
0
64 T
XIN
Figure 12-3 Wake-up from STOP mode by an interrupt
Figure 12-4 STOP mode release by an external reset
