HT66F016 datasheet(43/116 Pages) HOLTEK

43 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

· LVRC Register

Bit

76543210

Name

LVS7

LVS6

LVS5

LVS4

LVS3

LVS2

LVS1

LVS0

R/W

POR

01010011

Bit 7~0

LVS7~LVS0: LVR Voltage Select control

01010101: 2.1V

00110011: 2.55V

10011001: 3.15V

10101010: 3.8V

Any other value: Generates MCU reset -- LVRC register is reset to POR value

When an actual low voltage condition occurs, as specified by one of the four defined LVR voltage

values above, an MCU reset will be generated. The reset operation will be activated after 2~3

LIRC clock cycles. In this situation the register contents will remain the same after such a reset

occurs.

Any register value, other than the four defined LVR values above, will also result in the

generation of an MCU reset. The reset operation will be activated after 2~3 LIRC clock cycles.

However in this situation the register contents will be reset to the POR value.

Reset Initial Conditions

The different types of reset described affect the reset

flags in different ways. These flags, known as PDF and

TO are located in the status register and are controlled

by various microcontroller operations, such as the

SLEEP or IDLE Mode function or Watchdog Timer. The

reset flags are shown in the table:

PDF

RESET Conditions

Power-on reset

LVR reset during NORMAL or

SLOW Mode operation

WDT time-out reset during NORMAL or

SLOW Mode operation

WDT time-out reset during IDLE or

SLEEP Mode operation

Note:

²u² stands for unchanged.

The following table indicates the way in which the vari-

ous components of the microcontroller are affected after

a power-on reset occurs.

Item

Condition After RESET

Program Counter

Reset to zero

Interrupts

All interrupts will be disabled

WDT

Clear after reset, WDT begins

counting

Timer Modules

Timer Counter will be turned off

Input/Output Ports

I/O ports will be setup as inputs,

and AN0~AN3 as A/D input pins

Stack Pointer

Stack Pointer will point to the top

of the stack

HT66F016 Datasheet(PDF) 43 Page - Holtek Semiconductor Inc

HT66F016 Datasheet(HTML) 43 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