HT95R33 datasheet(40/59 Pages) HOLTEK

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HT95R33

Rev. 1.10

February 18, 2009

V D D

5 . 5 V

V L V R

0 . 9 V

0 V

R e s e t S i g n a l

R e s e t

* 1

* 2

N o r m a l O p e r a t i o n

R e s e t

L V R D e t e c t V o l t a g e

Low Voltage Reset

Note:

*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system

clock pulses before entering the normal operation.

*2: Since low voltage state has to be maintained in its original state for over 1ms, therefore after 1ms delay,

the device enters the reset mode.

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 PC0~PC1

Pull-high PC4~PC7

Pull-high PD

Pull-high PE3~PE0

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 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.

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 ex-

ecuted, 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.

LVR

Low Voltage Reset enable or disable

LVR Voltage

Low Voltage Reset voltage; 2.2V, 3.3V or 4.4V

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