HT82K68E-20 データシートの表示（PDF） - Holtek Semiconductor
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HT82K68E-20 Datasheet PDF : 39 Pages
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HT82K68E
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.
No.
ROM Code Option
OSC type selection. This option is to decide if an RC or Crystal oscillator is chosen as system clock. If the
1 Crystal oscillator is selected, the XST (Crystal Start-up Timer) default is activated, otherwise the XST is dis-
abled.
2
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. ²One time² means
3 that the CLR WDT instruction can clear the WDT. ²Two times² means only if both of the CLR WDT1 and CLR
WDT2 instructions have been executed, only then will the WDT be cleared.
4
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.
5
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.
6 LVR enable/disable. User can configure whether enable or disable the circuit by configuration option.
Application Circuits
RC Oscillator for Multiple I/O Applications
V DD
F .B .
10m.
0 .1 m F
VDD
V DD
40kW
fS Y S /4
(N M O S O p e n
D r a in O u tp u t)
V DD
O SC1
O SC2
IN 4 1 4 8
47kW
RESET
0 .1 m F
V DD
C LK
D ATA
CAP
NUM
SCR
C LK
D ATA
H T82K 68E
PA0 C0
PA1 C1
PA2 C2
PA3 C3
PA4 C4
PA5 C5
PA6 C6
PA7 C7
PB0 R0
PB1 R1
PB2 R2
PB3 R3
PB4 R4
PB5 R5
PB6 R6
PB7 R7
PD0 R8
PD1 R9
P D 2 R 10
P D 3 R 11
P D 4 R 12
P D 5 R 13
P D 6 R 14
P D 7 R 15
P C 6 R 16
P C 7 R 17
Crystal Oscillator or Ceramic Resonator for
Multiple I/O Applications
V DD
F .B .
10mF
R e s e rv e fo r
R e s o n a to r
0 .1 m F
VDD
O SC1
O SC2
V DD
IN 4 1 4 8
47kW
0 .1 m F
RESET
V DD
C LK
D ATA
CAP
NUM
SCR
C LK
D ATA
H T82K 68E
PA0 C0
PA1 C1
PA2 C2
PA3 C3
PA4 C4
PA5 C5
PA6 C6
PA7 C7
PB0 R0
PB1 R1
PB2 R2
PB3 R3
PB4 R4
PB5 R5
PB6 R6
PB7 R7
PD0 R8
PD1 R9
P D 2 R 10
P D 3 R 11
P D 4 R 12
P D 5 R 13
P D 6 R 14
P D 7 R 15
P C 6 R 16
P C 7 R 17
Rev. 2.00
16
July 10, 2007
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