HT95R35 Datasheet, PDF (56/73 Pages) Holtek Semiconductor Inc – Phone 8-Bit MCU with DTMF Receiver

HT95R35
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 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 PE
Pull-high PF
Pull-high PG
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.
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 ex-
ecuted, then WDT can be cleared.
WDT
Watchdog enable/disable
WDT Clock Source
WDT clock source selection
RC ® Select the WDT OSC to be the WDT source.
T1 ® 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; 2.1V, 3.15V or 4.2V
SPI Options
SIM
Enable/disable
SPI_WCOL
Enable/disable
SPI_CSEN
I²C Option
I²C debounce Time
Enable/disable, used to enable/disable (1/0) software CSEN function
No debounce, 1 system clock debounce, 2 system clock debounce
AUD Option
DAC output
Enable/disable
Rev. 1.00
56
October 7, 2009