Holtek BS83B24C Manual page 21

BS83B24C/BS83C40C
Touch Flash MCU
Operating Frequency Characteristic Curves
System Operating Frequency
16MHz
1�MHz
�MHz
System Start Up Time Characteristics
Symbol Parameter
S�stem Sta�t-�p Time
Wake-�p f�om Condition whe�e f
S�stem Sta�t-�p Time
t
SST
Wake-�p f�om Condition whe�e f
S�stem Speed Switch Time
�AST to SLOW Mode o�
SLOW to �AST Mode
S�stem Reset Dela� Time
Reset So��ce f�om Powe�-on Reset o�
LVR Ha�dwa�e Reset
S�stem Reset Dela� Time
t
RSTD
LVRC/WDTC/RSTC Softwa�e Reset
S�stem Reset Dela� Time
Reset Source from WDT Overflow
Minim�m Softwa�e Reset P�lse Width to
t
SRESET
Reset
Notes: 1. For the System Start-up time values, whether f
chosen f system oscillator. Details are provided in the System Operating Modes section.
SYS
2. The time units, shown by the symbols t
provided in the frequency tables. For example t
3. If the LIRC is used as the system clock and if it is off when in the SLEEP mode, when an additional
LIRC start up time, t
table above.
4. The System Speed Switch Time is effectively the time taken for the newly activated oscillator to start up.
Rev. 1.00
�.�V �.�V 3.3V
Operating Voltage
V
DD
— f
SYS
— f
SYS
is Off
SYS
— f
SYS
— f
SYS
is On
— f
SYS
SYS
— f
HIRC
— f
LXT
— RR
—
—
—
SYS
. are the inverse of the corresponding frequency values as
HIRC
=1/f
HIRC
, as provided in the LIRC frequency table, must be added to the t
START
�1
5.5V
Test Conditions
Min. Typ. Max. Unit
Conditions
=f ~ f /64� f =f —
H H H HIRC
=f =f —
SUB LXT
=f =f —
SUB LIRC
=f ~ f /64� f =f —
H H H HIRC
=f =f o� f —
SUB LXT LIRC
switches from off → on —
switches from off → on —
=5V/ms
POR
4�
—
— 14
— 45
is on or off depends upon the mode type and the
, t =1/f etc.
HIRC SYS SYS
Ta=-40°C~�5°C
16 — t
HIRC
10�4 — t
LXT
� — t
LIRC
� — t
H
� — t
SUB
16 — t
HIRC
10�4 — t
LXT
4� 54 ms
16 1� ms
90 1�0 μs
time in the
SST
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