HT68F14 HOLTEK [Holtek Semiconductor Inc], HT68F14 Datasheet - Page 44

• Manufacturer Part Number: HT68F14
• Description: Enhanced I/O Flash Type MCU
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

Rev. 1.10
Low Voltage Reset - LVR
Watchdog Time-out Reset during Normal Operation
Watchdog Time-out Reset during SLEEP or IDLE Mode
The microcontroller contains a low voltage reset circuit in order to monitor the supply voltage of the
device. The LVR function is selected via a configuration option. If the supply voltage of the device
drops to within a range of 0.9V~V
automatically reset the device internally. For a valid LVR signal, a low supply voltage, i.e., a voltage in the
range between 0.9V~V
If the low supply voltage state does not exceed this value, the LVR will ignore the low supply voltage and
will not perform a reset function. The actual V
The Watchdog time-out Reset during normal operation is the same as a hardware RES pin reset except
that the Watchdog time-out flag TO will be set to ²1².
The Watchdog time-out Reset during SLEEP or IDLE Mode is a little different from other kinds of
reset. Most of the conditions remain unchanged except that the Program Counter and the Stack Pointer
will be cleared to ²0² and the TO flag will be set to ²1². Refer to the A.C. Characteristics for t
Note: t
Note: t
Note:
RSTD
RSTD
The t
The t
is power-on delay, typical time=100ms
is power-on delay, typical time=100ms
SST
SST
is 15~16 clock cycles if the system clock source is provided by ERC or HIRC.
is 1024 clock for HXT. The t
WDT Time-out Reset during Normal Operation Timing Chart
WDT Time-out Reset during SLEEP or IDLE Timing Chart
LVR
must exist for a time greater than that specified by t
Low Voltage Reset Timing Chart
LVR
such as might occur when changing the battery, the LVR will
44
Enhanced I/O Flash Type MCU
LVR
SST
value can be selected via configuration options.
HT68F13/HT68F14/HT68F15
is 1~2 clock for LIRC.
LVR
in the A.C. characteristics.
February 9, 2011
SST
details.