參數(shù)資料
型號: ADUC814
廠商: Analog Devices, Inc.
英文描述: MicroConverter, Small Package 12-Bit ADC with Embedded Flash MCU
中文描述: MicroConverter的,小包裝12位ADC,嵌入式閃存MCU
文件頁數(shù): 64/72頁
文件大?。?/td> 846K
代理商: ADUC814
ADuC814
TIMING SPECIFICATIONS
1,2,3
Table 34. Clock Input (External Clock Driven XTAL1)
AV
DD
= 2.7 V to 3.3 V or 4.75 V to 5.25 V, DV
DD
= 2.7 V to 3.3 V or 4.75 V to 5.25 V; all specifications T
MIN
to T
MAX
, unless otherwise noted
Rev. A | Page 64 of 72
32.768 kHz External Crystal
Typ
30.52
15.16
15.16
20
20
0.476
5.7
Parameter
t
CK
t
CKL
t
CKH
t
CKR
t
CKF
1/t
CORE
t
CORE
t
CYC
Min
0.131
0.72
Max
16.78
91.55
Unit
μs
μs
μs
ns
ns
MHz
μs
μs
XTAL1 Period
XTAL1 Width Low
XTAL1 Width High
XTAL1 Rise Time
XTAL1 Fall Time
ADuC814 Core Clock Frequency
4
ADuC814 Core Clock Period
5
ADuC814 Machine Cycle Time
6
1
AC inputs during testing are driven at DV
DD
– 0.5 V for a Logic 1, and at 0.45 V for a Logic 0. Timing measurements are made at V
IH
min for a Logic 1, and at V
IL
max for a
Logic 0 as shown in Figure 61.
2
For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs. A port pin begins to float when a 100 mV change from the
loaded V
OH
/V
OL
level occurs as shown in Figure 61.
3
C
LOAD
for all outputs = 80 pF, unless otherwise noted.
4
ADuC814 internal PLL locks onto a multiple (512 times) the external crystal frequency of 32.768 kHz to provide a stable 16.777216 MHz internal clock for the system.
The core can operate at this frequency or at a binary submultiple called Core_Clk, selected via the PLLCON SFR.
5
This number is measured at the default Core_Clk operating frequency of 2.09 MHz.
6
ADuC814 Machine Cycle Time is nominally defined as 12/Core_CLK.
t
CKH
t
CKL
t
CK
t
CKF
t
CKR
0
Figure 60. XTAL1 Input
DV
DD
– 0.5V
0.45V
0.2DV
DD
+ 0.9V
TEST POINTS
0.2DV
DD
– 0.1V
V
LOAD
– 0.1V
V
LOAD
V
LOAD
+ 0.1V
V
LOAD
– 0.1V
V
LOAD
+ 0.1V
TIMING
REFERENCE
POINT
V
LOAD
0
Figure 61. Timing Waveform Characteristics
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