參數(shù)資料
型號: CXP851P16
英文描述: CMOS 8-bit Single Chip Microcomputer
中文描述: 的CMOS 8位單片機
文件頁數(shù): 11/20頁
文件大?。?/td> 260K
代理商: CXP851P16
11
CXP851P16
AC Characteristics
(1) Clock timing
tsys indicates three values according to the contents of the clock control register (address: 00FE
H
) upper 2
bits (CPU clock selection).
t
sys (ns) = 2000/fc (Upper 2 bits = "00"), 4000/fc (Upper 2 bits = "01"), 16000/fc (Upper 2 bits = "11")
System clock frequency
System clock input
pulse width
System clock
rise and fall times
Event counter
input clock pulse width
Event counter input
clock rise and fall times
f
C
t
XL
,
t
XH
t
CR
,
t
CF
t
EH
,
t
EL
t
ER
,
t
EF
XTAL
EXTAL
EXTAL
EXTAL
EC
EC
MHz
ns
ns
ns
ms
Item
Symbol
Pin
Condition
Min.
Max.
Unit
Fig. 1, Fig. 2
Fig. 1, Fig. 2
External clock drive
Fig. 1, Fig. 2
External clock drive
Fig. 3
Fig. 3
4.5
200
20
3.5
100
t
sys + 50
(Ta =
10 to +75
°
C, V
DD
= 4.5 to 5.5V, Vss = 0V)
Fig. 1. Clock timing
EXTAL
t
XH
t
XL
t
CF
t
CR
0.4V
V
DD
0.4V
1/fc
Fig, 2. Clock applied condition
AAAAA
C
1
AAAAA
AAAAA
AAAAA
AAAAA
AAAAA
Ceramic oscillator
External clock
OPEN
C
2
Fig. 3. Event count clock timing
EC
t
EH
t
EL
t
EF
t
ER
0.2V
DD
0.8V
DD
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