ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 458

• Manufacturer Part Number: ATMEGA128RFA1-ZU
• Description: IC AVR MCU 2.4GHZ XCEIVER 64QFN
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA128RFA1-ZU

• Frequency: 2.4GHz
• Data Rate - Maximum: 2Mbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 3.5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 12.5mA
• Current - Transmitting: 14.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 128kB Flash, 4kB EEPROM, 16kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN, Exposed Pad
• Rf Ic Case Style: QFN
• No. Of Pins: 64
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Processor Series: ATMEGA128x
• Core: AVR8
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 16 KB
• Interface Type: JTAG
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 6
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVR128RFA1-EK1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

30.6.11 Preventing Flash Corruption
30.6.12 Programming Time for Flash when Using SPM
30.6.13 Simple Assembly Code Example for a Boot Loader
458
ATmega128RFA1
During periods of V
voltage is too low for the CPU and the Flash to operate properly. These issues are the
same as for board level systems using Flash, and the same design solutions should be
applied.
A Flash program corruption can be caused by two situations when the voltage is too
low. First, a regular write sequence to the Flash requires a minimum voltage to operate
correctly. Secondly, the CPU itself can execute instructions incorrectly, if the supply
voltage for executing instructions is too low.
Flash corruption can easily be avoided by following these design recommendations
(one is sufficient):
1. If there is no need for a Boot Loader update in the system, program the Boot Loader
2. Keep the AVR RESET active (low) during periods of insufficient power supply
3. Keep the AVR core in Power-down sleep mode during periods of low V
The calibrated RC Oscillator is used to time Flash accesses.
the typical programming time for Flash accesses from the CPU.
Table 30-4. SPM Programming Time
Flash write (Page Write, and write
Lock bits by SPM)
Flash write (Page Erase)
Assembly Code Example
Lock bits to prevent any Boot Loader software updates.
voltage. This can be done by enabling the internal Brown-out Detector (BOD) if the
operating voltage matches the detection level. If not, an external low V
protection circuit can be used. If a reset occurs while a write operation is in progress,
the write operation will be completed under the condition that the power supply
voltage is sufficient.
will prevent the CPU from attempting to decode and execute instructions, effectively
protecting the SPMCSR Register and thus the Flash from unintentional writes.
;-the routine writes one page of data from RAM to Flash
; the first data location in RAM is pointed to by the Y pointer
; the first data location in Flash is pointed to by the Z-pointer
;-error handling is not included
;-the routine must be placed inside the Boot space
; (at least the Do_spm sub routine). Only code inside NRWW section
; can be read during Self-Programming (Page Erase and Page Write).
;-registers used: r0, r1, temp1 (r16), temp2 (r17), looplo (r24),
; loophi (r25), spmcrval (r20)
; storing and restoring of registers is not included in the routine
; register usage can be optimized at the expense of code size
;-It is assumed that either the interrupt table is moved to the
; Boot loader section or that the interrupts are disabled.
Symbol
DEVDD
<1.8V, the Flash program can be corrupted because the supply
(1)
Min Programming Time
3.7 ms
7.3 ms
Table 30-4 below
Max Programming Time
8266A-MCU Wireless-12/09
4.5 ms
8.9 ms
DEVDD
DEVDD
shows
. This
reset