Operating Frequency Characteristic Curves; System Start Up Time Characteristics - Holtek HT67F2350 Manual

Operating Frequency Characteristic Curves

System Operating Frequency
16MHz
12MHz
8MHz

System Start Up Time Characteristics

Symbol Parameter
System Start-up Time
Wake-up from Condition where f
t
System Start-up Time
SST
Wake-up from Condition where f
System Speed Switch Time
FAST to Slow Mode or SLOW to FAST
Mode
System Reset Delay Time
Reset Source from Power-on Reset or
LVR Hardware Reset
System Reset Delay Time
t
RSTD
LVRC/WDTC/RSTC Software Reset
System Reset Delay Time
Reset Source from WDT Overflow
or Reset pin 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
values as 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, then an additional
LIRC start up time, t
START
table above.
4. The System Speed Switch Time is effectively the time taken for the newly activated oscillator to start up.
Rev. 1.60
Advanced A/D Flash MCU with LCD & EEPROM
2.2V 2.7V 3.3V
Operating Voltage
Test Conditions
V
DD
f =f ~ f
SYS H
f =f ~ f
SYS H
—
is off
f =f
SYS
SYS SUB
f =f
SYS SUB
f =f ~ f
SYS H
—
is on
f =f
SYS
SYS SUB
f switches from off → on
HXT
— f switches from off → on
HIRC
f switches from off → on
LXT
— RR =5V/ms
POR
—
—
is on or off depends upon the mode type and the
SYS
, t etc. are the inverse of the corresponding frequency
HXT HIRC
, as provided in the LIRC frequency table, must be added to the t
44
HT67F2350/HT67F2360
HT67F2370/HT67F2390
5.5V
Ta= -40°C ~ 85°C
Min. Typ. Max. Unit
Conditions
/64, f =f — 128
H H HXT
/64, f =f — 16
H H HIRC
=f — 1024
LXT
=f — 2
LIRC
/64, f =f or f — 2
H H HXT HIRC
=f or f — 2
LXT LIRC
— 1024
— 16
— 1024
42 48
—
— 14 16
=1/f , t =1/f etc.
HIRC HIRC SYS SYS
— t
HXT
— t
HIRC
— t
LXT
— t
LIRC
— t
H
— t
SUB
— t
HXT
— t
HIRC
— t
LXT
54
ms
18
time in the
SST
May 16, 2019