HT68F03 datasheet(123/139 Pages) HOLTEK

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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

High Speed/Low Speed System Oscillator Selection - fOSC:

1. HXT + LIRC

2. ERC + LIRC

3. HIRC + LIRC

4. HIRC + LXT

WDT Clock Selection - fS:

1. fSUB

2. fSYS/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 fOSC configuration option.

Reset Pin Options

PA7/RES Pin Options:

1. RES pin

2. I/O pin

Watchdog Options

Watchdog Timer Function:

1. Enable

2. Disable

CLRWDT Instructions Selection:

1. 1 instructions

2. 2 instructions

LVR Options

LVR Function:

1. Enable

2. Disable

LVR Voltage Selection:

1. 2.10V

2. 2.55V

3. 3.15V

4. 4.20V

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

123

April 16, 2010

HT68F03 Datasheet(PDF) 123 Page - Holtek Semiconductor Inc

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