HT68FU50 datasheet(177/244 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 system oscillator selection - fH:

1. HXT

2. ERC

3. HIRC

Low speed system oscillator selection - fL:

1. LXT

2. LIRC

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 fL configuration option.

Reset Pin Options

PB0/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

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

HT68FU30/HT68FU40/HT68FU50/HT68FU60

Rev. 1.50

177

March 15, 2011

HT68FU50 数据表(PDF) 177 Page - Holtek Semiconductor Inc

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