HT82K68A-28 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT82K68A-28 Datasheet PDF : 39 Pages
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HT82K68A
Mask Option
The following shows five kinds of mask option in the HT82K68A. All the mask options must be defined to ensure proper
system function.
No.
Mask 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 ²CLR WDT² instruction can clear the WDT. ²Two times² means only if both of the ²CLR WDT1² and
²CLR WDT2² 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.
7
Input type selection. The input type can select inverter or Schmitt by mask option (for OTP version, only
Schmitt input type can used)
Application Circuits
R C O s c illa to r fo r M u ltip le I/O A p p lic a tio n s
V DD
F .B .
VDD
1 0 m F 0 .1 m F
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 D D
O SC1
O SC2
47kW
1N 4148
RESET
0 .1 m F
V DD
C LK
D ATA
CAP
NUM
SCR
C LK
D ATA
H T82K 68A
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
C r y s ta l O s c illa to r o r C e r a m ic R e s o n a to r
fo r M u ltip le I/O A p p lic a tio n s
V DD
F .B .
10mF
0 .1 m F
R e s e rv e fo r
R e s o n a to r
VDD
O SC1
O SC2
V DD
1N 4148
0 .1 m F
47kW
RESET
V DD
C LK
D ATA
CAP
NUM
SCR
C LK
D ATA
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
H T82K 68A
Rev. 1.70
16
December 26, 2005
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