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
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