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HT48RA0A bảng dữ liệu(PDF) 3 Page - Holtek Semiconductor Inc

tên linh kiện HT48RA0A
Giải thích chi tiết về linh kiện  8-Bit Remote Type MCU
PDF  31 Pages
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nhà sản xuất  HOLTEK [Holtek Semiconductor Inc]
Trang chủ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48RA0A bảng dữ liệu(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
¾
LVR disabled
2.2
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
IOL
I/O Ports Sink Current
3V
VOL=0.1VDD
1.5
2.5
¾
mA
IOH
PC0/REM Output Source Current
3V
VOH=0.9VDD
-1
-1.5
¾
mA
RPH1
Pull-high Resistance of PA Port,
PB0~PB1 and RES
3V
¾¾
60
¾
k
W
RPH2
Pull-high Resistance of PB2~PB7
3V
¾¾
60
¾
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 or wake-up from HALT
¾
1024
¾
tSYS
Note: tSYS=1/fSYS
HT48RA0A
Rev. 1.70
3
July 16, 2003
Functional Description
Execution Flow
The HT48RA0A system clock can be derived from a
crystal/ceramic resonator oscillator. It is internally di-
vided 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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