HT95R25 datasheet(35/51 Pages) HOLTEK

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HT95R25

Rev. 1.00

March 6, 2009

Configuration Options

Configuration options refer to certain options within the MCU that are programmed into the MTP Program Memory de-

vice during the programming 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 by the application software.

All options must be defined for proper system function, the details of which are shown in the table.

Name

Options

Wake-up PA

Port A wake-up selection.

Define the activity of wake-up function.

All port A have the capability to wake-up the chip from a HALT.

This wake-up function is selected per bit.

Pull-high PA

Pull-high PB

Pull-high PC0~PC1

Pull-high PC4~PC7

Pull-high PD

Pull-high PE

Pull-high PF

Pull-high PG3~PG0

Pull-high option.

This option determines whether the pull-high resistance is viable or not.

Port A pull-high option is selected per bit.

Port B pull-high option is selected per bit.

Port C pull-high option is selected per bit.

Port D pull-high option is selected per nibble.

Port E pull-high option is selected per nibble.

Port F pull-high option is selected per nibble.

Port G pull-high option is selected per nibble.

CLRWDT

This option defines how to clear the WDT by instruction.

One clear instruction: The

²CLR WDT² can clear the WDT.

Two clear instructions: Only when both of the

²CLR WDT1² and ²CLR WDT2² have been exe-

cuted, then WDT can be cleared.

WDT

Watchdog enable/disable

WDT Clock Source

WDT clock source selection

® Select the WDT OSC to be the WDT source.

® Select the instruction clock to be the WDT source.

32kHz

® Select the external 32768Hz to be the WDT source.

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