HT46R065D datasheet(41/114 Pages) HOLTEK

41 / 114 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.

RES PinReset

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.

LowVoltageReset

- LVR

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~VLVR such as might occur when changing the battery, the 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~VLVR must exist for a time greater than that specified by tLVR in the A.C.

characteristics. 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 VLVR value can be selected via

configuration options.

Rev.1.00

January12,2011

HT46R064D/065D/066D

EnhancedA/DType8-Bit OTP MCU withLEDDriver

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 ispower-ondelay,typicaltime=50ms

RES ResetTimingChart

R E S / P A 7

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 Itisrecommendedthatthiscomponentisaddedforadded ESD protection

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

issignificant

External RES Circuit

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 ispower-ondelay,typicaltime=50ms

LowVoltageResetTimingChart

HT46R065D Datasheet(PDF) 41 Page - Holtek Semiconductor Inc

HT46R065D Datasheet(HTML) 41 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL