參數(shù)資料
型號: EVAL-ADUC7121QSPZ
廠商: Analog Devices Inc
文件頁數(shù): 42/96頁
文件大?。?/td> 0K
描述: BOARD EVALUATION FOR ADUC7121
設計資源: ADUC7121 Gerber Files
ADUC7121 Schematic
標準包裝: 1
系列: MicroConverter® ADuC7xxx
類型: MCU
適用于相關產(chǎn)品: ADUC7121
所含物品: 板,CD
Data Sheet
ADuC7121
Rev. B | Page 47 of 96
Example Source Code
T2LD = 5;
TCON = 0x480;
while ((T2VAL == t2val_old) || (T2VAL > 3))
//ensures timer value loaded
IRQEN = 0x10;
//enable T2 interrupt
PLLKEY1 = 0xAA;
PLLCON = 0x01;
PLLKEY2 = 0x55;
POWKEY1 = 0x01;
POWCON =
0x27;
// set
core into nap mode
POWKEY2 = 0xF4;
External Clock Selection
To switch to an external clock on P1.4 (of the
P1.4/PWM1/ECLK/XCLK/PLAI[8] pin), configure P1.4 in
Mode 2. The external clock can be up to 41.78 MHz.
Example Source Code
T2LD = 5;
TCON = 0x480;
while ((T2VAL == t2val_old) || (T2VAL > 3))
//ensures timer value loaded
IRQEN = 0x10;
//enable T2 interrupt
PLLKEY1 = 0xAA;
PLLCON = 0x03; //Select external clock
PLLKEY2 = 0x55;
POWKEY1 = 0x01;
POWCON = 0x27; // Set Core into Nap mode
POWKEY2 = 0xF4;
Power Control System
A choice of operating modes is available on the ADuC7121.
Table 65 describes what part of the ADuC7121 is powered on in
the different modes and indicates the power-up time. Table 66
gives some typical values of the total current consumption (analog
+ digital supply currents) in the different modes, depending on
the clock divider bits. The ADC is turned off. Note that these
values also include current consumption of the regulator and other
parts on the test board on which these values were measured.
Table 65. Operating Modes
Mode
Core
Peripherals
PLL
XTAL/Timer2/Timer3
External IRQ
Start-Up/Power-On Time
Active
On
66 ms at CD = 0
Pause
On
24 ns at CD = 0; 3.06 s at CD = 7
Nap
On
24 ns at CD = 0; 3.06 s at CD = 7
Sleep
On
1.58 ms
Stop
On
1.7 ms
Table 66. Typical Current Consumption at 25°C
PC[2:0]
Mode
CD = 0
CD = 1
CD = 2
CD = 3
CD = 4
CD = 5
CD = 6
CD = 7
000
Active
33.1
21.2
13.8
10
8.1
7.2
6.7
6.45
001
Pause
22.7
13.3
8.5
6.1
4.9
4.3
4
3.85
010
Nap
3.8
011
Sleep
0.4
100
Stop
0.4
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