SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 117

• Manufacturer Part Number: SAM7L128
• Manufacturer: Atmel Corporation

Specifications of SAM7L128

• Flash (kbytes): 128 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 36 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 80
• Ext Interrupts: 80
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 3
• Segment Lcd: 40
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 460
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 6
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 1.8 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

17.3.7.3
17.3.7.4
6257A–ATARM–20-Feb-08
Clock Alarms
Brownout Detector
All the resulting signals are wired-ORed to trigger a debounce counter, which can be pro-
grammed with the WKUPDBC field in the Supply Controller Wake Up Mode Register,
SUPC_WUMR. The WKUPDBC field can select a debouncing period of 3, 32, 512, 4,096 or
32,768 slow clock cycles. This corresponds respectively to about 100 µs, about 1 ms, about
16 ms, about 128 ms and about 1 second (for a typical slow clock frequency of 32 kHz). Pro-
gramming WKUPDBC to 0x0 selects an immediate wake up, i.e., an enabled WKUP pin must be
active according to its polarity during a minimum of one slow clock period to wake up the core
power supply.
If an enabled WKUP pin is asserted for a time longer than the debouncing period, a wake up of
the core power supply is started and the signals, WKUP0 to WKUP15 as shown in
are latched in the Supply Controller Status Register, SUPC_SR. This allows the user to identify
the source of the wake up, however, if a new wake up condition occurs, the primary information
is lost. No new wake up can be detected since the primary wake up condition has disappeared.
The RTC alarm can generate a wake up of the core power supply. This can be enabled by writ-
ing, the bit RTCEN to 1 in the Supply Controller Wake Up Mode Register, SUPC_WUMR.
The Supply Controller does not provide any status as the information is available in the User
Interface of the Real Time Clock.
The brownout detector can generate a wake up of the core power supply. This can be enabled
by writing the BODEN bit to 1 in the Supply Controller Mode Register, SUPC_MR.
The Supply Controller provides two status bits in the Supply Controller Status Register for the
brownout detector which allow to determine whether the last wake up was due to the brownout
detector:
• the BROWNOUT bit provides real time information, which is updated at each measurement
• the BODS bit provides saved information and shows a brownout has occurred since the last
cycle or updated at each Slow Clock cycle, if the measurement is continuous
read of SUPC_SR
AT91SAM7L128/64 Preliminary
Figure
17-8,
117