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HT66F20 Datasheet(PDF) 183 Page - Holtek Semiconductor Inc

Part # HT66F20
Description  Enhanced A/D Flash Type MCU 8-Bit MCU with EEPROM
PDF  250 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 183 Page - Holtek Semiconductor Inc

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Configuration Options
Configuration options refer to certain options within the MCU that are programmed into the device during the program-
ming process. During the development process, these options are selected using the HT-IDE software development
tools. As these options are programmed into the device using the hardware programming tools, once they are selected
they cannot be changed later using the application program. All options must be defined for proper system function, the
details of which are shown in the table.
No.
Options
Oscillator Options
1
High Speed System Oscillator Selection - fH:
1. HXT
2. ERC
3. HIRC
2
Low Speed System Oscillator Selection - fL:
1. LXT
2. LIRC
3
WDT Clock Selection - fS:
1. fSUB
2. fSYS/4
4
HIRC Frequency Selection:
1. 4MHz
2. 8MHz
3. 12MHz
Note: The fSUB and the fTBC clock source are LXT or LIRC selection by the fL configuration option.
Reset Pin Options
5
PB0/RES Pin Options:
1. RES pin
2. I/O pin
Watchdog Options
6
Watchdog Timer Function:
1. Enable
2. Disable
7
CLRWDT Instructions Selection:
1. 1 instructions
2. 2 instructions
LVR Options
8
LVR Function:
1. Enable
2. Disable
9
LVR Voltage Selection:
1. 2.10V
2. 2.55V
3. 3.15V
4. 4.20V
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
Rev. 1.20
183
June 4, 2010



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