at91sam7l128 ATMEL Corporation, at91sam7l128 Datasheet - Page 13

• Manufacturer Part Number: at91sam7l128
• Description: At91 Arm Thumb-based Microcontroller
• Manufacturer: ATMEL Corporation

5.2.3
5.2.4
5.2.5
5.2.6
Table 5-1.
Notes:
6257AS–ATARM–28-Feb-08
Mode
Off Mode
Backup Mode
(with SRAM and
RTC)
Wait Mode (with
SRAM and RTC)
Idle Mode
1. When considering wake-up time, the time required to start the PLL is not taken into account. Once started, the
2. The external LCD current consumption and the external loads on PIOs are not taken into account in the calculation.
3. BOD current consumption is not included.
4. Depends on MCK frequency.
Wait Mode
Idle Mode
Active Mode
Low Power Mode Summary Table
AT91SAM7128/L64 works with the 2 MHz Fast RC oscillator. The user has to add the PLL start-up time if it is needed in the
system. The wake-up time is defined as the time taken for wake up until the first instruction is fetched.
Low Power Mode Configuration Summary
FWUP
X
X
X
X
Oscillator,
SUPC,
32 kHz
Table 5-1 on page 13
When entering this mode, all PIO pins keep their previous states, they are reinitialized as inputs
with pull-ups at wake-up.
The AT91SAM7L128/64 can be awakened from this mode through the FWUP pin, an event on
WUP0-15 pins, or an RTC alarm or brownout event.
Current consumption is 3.5 µA typical without the LCD controller running.
In wait mode, the voltage regulator must be set in deep mode. Voltage regulator output voltage
should be set at a minimum voltage to decrease leakage in the digital core. No clock is running
in the core. From this mode, a fast start-up is available (refer to
In this mode, all PIO pins keep their previous states.
The processor is in idle mode which means that the processor has no clock but the Master clock
(MCK) remains running. The processor can also be wakened by an IRQ or FIQ.
The total dynamic power consumption is less than 30 mA at full speed (36 MHz) when running
out of the Flash. The power management controller can be used to adapt the frequency and the
regulator output voltage can be adjusted to optimize power consumption.
The modes detailed above are the main modes. In off mode, no options are available but once
the shutdown controller is set to on, each part can be set to on, or off, separately and more
modes can be active. The table below shows a summary of the configurations of the low power
modes.
POR
X
X
X
RTC
X
X
Backup
SRAM
X
X
X
shows an example of backup mode with backup SRAM and RTC running.
(Deep Mode)
Regulator
X
X
AT91SAM7L128/64 Preliminary
Core
X
X
FWUP pin
FWUP pin
WUP0-15 pins
BOD alarm
RTC alarm
Fast start-up through
WUP0-15 pins
IRQs
FIQ
Potential Wake-up
Sources
Section 5.4 ”Fast
Consumption
100 nA typ
3.5 µA typ
9 µA typ
(4)
(2)(3)
Wake-up Time
< 5 ms
< 0.5 ms
< 2 µs (in case of
fast start-up)
(4)
Start-Up”).
13
(1)