BS2824 Holtek Semiconductor Inc., BS2824 Datasheet - Page 42

• Manufacturer Part Number: BS2824
• Description: Touch Key Mcu
• Manufacturer: Holtek Semiconductor Inc.

BS2824/BS2854/BS2868
Touch Key MCU
Rev. 1.00
Note:
For applications that operate within an environment where more noise is present the Enhanced
Reset Circuit shown is recommended.
More information regarding external reset circuits is located in Application Note HA0075E on the
Holtek website.
This type of reset occurs when the microcontroller is already running and the RES pin is forcefully
pulled low by external hardware such as an external switch. In this case as in the case of other
reset, the Program Counter will reset to zero and program execution initiated from this point.
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
LVR will 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
t
will ignore the low supply voltage and will not perform a reset function. The actual V
be selected via configuration options.
RES Pin Reset
Low Voltage Reset LVR
LVR
in the A.C. characteristics. If the low supply voltage state does not exceed this value, the LVR
is significant
* It is recommended that this component is added for added ESD protection
** It is recommended that this component is added in environments where power line noise
Note: t
Note: t
RSTD
RSTD
Low Voltage Reset Timing Chart
is power-on delay, typical time=100ms
is power-on delay, typical time=100ms
RES Reset Timing Chart
External RES Circuit
42
LVR
LVR
such as might occur when changing the battery, the
must exist for a time greater than that specified by
January 27, 2010
LVR
value can