HT82K68E_07 HOLTEK [Holtek Semiconductor Inc], HT82K68E_07 Datasheet - Page 16

• Manufacturer Part Number: HT82K68E_07
• Description: Multimedia Keyboard Encoder 8-Bit OTP MCU
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

ROM Code Option
The following shows six kinds of ROM code option in the HT82K68E. All the ROM code options must be defined to en-
sure proper system function.
Application Circuits
RC Oscillator for Multiple I/O Applications
Rev. 2.00
No.
1
2
3
4
5
6
OSC type selection. This option is to decide if an RC or Crystal oscillator is chosen as system clock. If the
Crystal oscillator is selected, the XST (Crystal Start-up Timer) default is activated, otherwise the XST is dis-
abled.
WDT source selection. There are three types of selection: on-chip RC oscillator, instruction clock or disable
the WDT.
CLRWDT times selection. This option defines the way to clear the WDT by instruction. One time means
that the CLR WDT instruction can clear the WDT. Two times means only if both of the CLR WDT1 and CLR
WDT2 instructions have been executed, only then will the WDT be cleared.
Wake-up selection. This option defines the wake-up function activity. External I/O pins (PA and PC [0:3] only)
all have the capability to wake-up the chip from a HALT.
Pull-high selection. This option is to decide whether the pull-high resistance is visible or not in the input mode
of the I/O ports. Each bit of an I/O port can be independently selected.
LVR enable/disable. User can configure whether enable or disable the circuit by configuration option.
.
ROM Code Option
16
Crystal Oscillator or Ceramic Resonator for
Multiple I/O Applications
HT82K68E
July 10, 2007