HT67F60 datasheet(72/242 Pages) HOLTEK

72 / 242 page

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPRO

● RES Pin

As the reset pin is shared with PB.0, the reset function must be selected using a configuration

option. Although the has an internal RC reset function, if the VDD power supply rise time is not

fast enough or does not stabilise quickly at power-on, the internal reset function may be incapable

of providing proper reset operation. For this reason it is recommended that an external RC

network is connected to the RES pin, whose additional time delay will ensure that the RES pin

remains low for an extended period to allow the power supply to stabilise. During this time delay,

normal operation of the will be inhibited. After the RES line reaches a certain voltage value, the

reset delay time tRSTD is invoked to provide an extra delay time after which the will begin normal

operation. The abbreviation SST in the figures stands for System Start-up Timer.

For most applications a resistor connected between VDD and the RES pin and a capacitor

connected between VSS and the RES pin will provide a suitable external reset circuit. Any wiring

connected to the RES pin should be kept as short as possible to minimise any stray noise

interference.

For applications that operate within an environment where more noise is present the Enhanced

Reset Circuit shown is recommended.

PB 0/ RE S

0. 1~ 1 m F

10k W ~

100k W

VD D

VS S

0. 01 m F* *

V DD

1N 4148*

300 W *

External RES Circuit

Note: * 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 is significant.

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.

RE S

In te r nal R es et

0. 9 V DD

0. 4 V DD

t RS TD + t SST

RES Reset Timing Chart

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

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