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HT48CA0-2 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

Part # HT48CA0-2
Description  Remote Type 8-Bit MCU
Download  32 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48CA0-2 Datasheet(HTML) 3 Page - Holtek Semiconductor Inc

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D.C. Characteristics
Ta=25
°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VDD
Conditions
VDD
Operating Voltage
¾¾
2.0
¾
3.6
V
IDD
Operating Current
3V
No load, fSYS=4MHz
¾
0.7
1.5
mA
ISTB
Standby Current
3V
No load, system HALT
¾¾
1
mA
VIL1
Input Low Voltage for I/O Ports
3V
¾
0
¾
0.3VDD
V
VIH1
Input High Voltage for I/O Ports
3V
¾
0.7VDD
¾
VDD
V
VIL2
Input Low Voltage (RES)3V
¾
0
¾
0.4VDD
V
VIH2
Input High Voltage (RES)3V
¾
0.9VDD
¾
VDD
V
VLVR
Low Voltage Reset Voltage
¾¾
¾
1.9
2.0
V
IOL
I/O Ports Sink Current
3V
VOL=0.1VDD
48
¾
mA
IOH
PC0/REM Output Source Current
3V
VOH=0.9VDD
-2
-4
¾
mA
RPH
Pull-high Resistance
3V
¾
20
60
100
k
W
A.C. Characteristics
Ta=25
°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VDD
Conditions
fSYS
System Clock
3V
¾
400
¾
4000
kHz
tRES
External Reset Low Pulse Width
¾¾
1
¾¾
ms
tSST
System Start-up Timer Period
¾
Power-up, reset or wake-up
from HALT
¾
1024
¾
tSYS
tLVR
Low Voltage Width to Reset
¾¾
1
¾¾
ms
Note: tSYS=1/fSYS
HT48RA0-2/HT48CA0-2
Rev. 1.50
3
July 23, 2004
Functional Description
Execution Flow
The HT48RA0-2/HT48CA0-2 system clock can be de-
rived from a crystal/ceramic resonator oscillator. It is in-
ternally divided into four non-overlapping clocks. One
instruction cycle consists of four system clock cycles.
Instruction fetching and execution are pipelined in such
a way that a fetch takes one instruction cycle while de-
coding and execution takes the next instruction cycle.
However, the pipelining scheme causes each instruc-
tion to effectively execute within one cycle. If an instruc-
tion changes the program counter, two cycles are
required to complete the instruction.
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
F e t c h I N S T ( P C )
E x e c u t e I N S T ( P C - 1 )
F e t c h I N S T ( P C + 1 )
E x e c u t e I N S T ( P C )
F e t c h I N S T ( P C + 2 )
E x e c u t e I N S T ( P C + 1 )
P C
P C + 1
P C + 2
S y s t e m C l o c k
I n s t r u c t i o n C y c l e
P C
Execution Flow


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