HT45F23 datasheet(53/152 Pages) HOLTEK

53 / 152 page

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.

Pulling the RES Pin low using external hardware will also execute a device reset. In this case, as in

the case of other resets, the Program Counter will reset to zero and program execution initiated from

this point.

· Low Voltage Reset

- LVR

The microcontroller contains a low voltage reset circuit in order to monitor the supply voltage of the

device, which is selected via a configuration option. If the supply voltage of the device drops to within a

range of 0.9V~VLVR such as might occur when changing the battery, the LVR will automatically reset the

device internally. The LVR includes the following specifications: For a valid LVR signal, a low voltage,

i.e., a voltage in the range between 0.9V~VLVR must exist for greater than the value tLVR specified in the

A.C. characteristics. If the low voltage state does not exceed tLVR, the LVR will ignore it and will not

perform a reset function. One of a range of specified voltage values for VLVR can be selected using

configuration options.

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

September 15, 2011

R E S / P B 6

0 . 1 ~ 1 m F

1 0 k W ~

1 0 0 k W

V D D

V S S

0 . 0 1 m F * *

V D D

1 N 4 1 4 8 *

3 0 0 W *

Note:

²*² It is recommended that this component is added for added ESD protection

²**² It is recommended that this component is added in environments where power line noise

is significant

External RES Circuit

R E S

I n t e r n a l R e s e t

0 . 9 V D D

0 . 4 V D D

t R S T D + t S S T

Note: tRSTD is power-on delay, typical time=100ms

RES Reset Timing Chart

L V R

I n t e r n a l R e s e t

t R S T D + t S S T

Note: tRSTD is power-on delay, typical time=100ms

Low Voltage Reset Timing Chart

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