參數(shù)資料
型號： TMS320F240PQS
英文描述： 16-Bit Microcontroller
中文描述： 16位微控制器
文件頁數(shù)： 29/105頁
文件大小： 1481K
代理商： TMS320F240PQS
TMS320C240, TMS320F240
DSP CONTROLLERS
SPRS042D – OCTOBER 1996 – REVISED NOVEMBER 1998
29
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
low-power modes
The TMS320x240 has four low-power modes (idle 1, idle 2, PLL power down, and oscillator power down). The
low-power modes reduce the operating power by reducing or stopping the activity of various modules (by
stopping their clocks). The two PLLPM bits of the clock module control register, CKCR0, select which of the
low-power modes the device enters when executing an IDLE instruction. Reset or an unmasked interrupt from
any source causes the device to exit from idle 1 low-power mode. A real-time interrupt from the watchdog timer
module causes the device to exit from all low-power modes except oscillator power down. This is a wake-up
interrupt. When enabled, reset or any of the four external interrupts (NMI, XINT1, XINT2, or XINT3) causes the
device to exit from any of the low-power modes (idle 1, idle 2, PLL power down, and oscillator power down).
The external interrupts are all wake-up interrupts. The maskable external interrupts (XINT1, XINT2, and XINT3)
must be enabled individually and globally to bring the device out of a low-power mode properly. It is, therefore,
important to ensure that the desired low-power-mode exit path is enabled before entering a low-power mode.
Figure 9 shows the wake-up sequence from a power down. Table 9 summarizes the low-power modes.
Watchdog Timer
and
Real-Time Interrupt
Module
NMI
XINT1
XINT2
XINT3
External-Interrupt Logic
Reset Logic
Reset
Signal
Wake-up Signal
to CPU
Wake-up
Signal
System Module
Figure 9. Waking Up the Device From Power Down
Table 9. Low-Power Modes
LOW-
POWER
MODE
PLLPM(x)
BITS IN
CKCR0[2:3]
CPUCLK
STATUS
SYSCLK
STATUS
WDCLK
STATUS
PLL
STATUS
OSC
STATUS
EXIT
CONDITION
TYPICAL
POWER
Run
XX
On
On
On
On
On
–
80 mA
Idle 1
00
Off
On
On
On
On
Any interrupt
or reset
50 mA
Idle 2
01
Off
Off
On
On
On
Wake-up
interrupt or
reset
7 mA
PLL Power
Down
10
Off
Off
On
Off
On
Wake-up
interrupt or
reset
1 mA
OSC Power
Down
11
Off
Off
Off
Off
Off
Wake-up
interrupt or
reset
400 A
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