ATMEGA128A-ANR Atmel, ATMEGA128A-ANR Datasheet - Page 28

• Manufacturer Part Number: ATMEGA128A-ANR
• Description: IC MCU AVR 128K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-ANR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Core: AVR8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.5.9
8151H–AVR–02/11
Using all 64 Kbytes Locations of External Memory
Figure 7-10. Address Map with 32Kbytes External Memory
Since the External Memory is mapped after the Internal Memory as shown in
60Kbytes of External Memory is available by default (address space 0x0000 to 0x10FF is
reserved for internal memory). However, it is possible to take advantage of the entire External
Memory by masking the higher address bits to zero. This can be done by using the XMMn bits
and control by software the most significant bits of the address. By setting Port C to output 0x00,
and releasing the most significant bits for normal Port Pin operation, the Memory Interface will
address 0x0000 - 0x1FFF. See the following code examples.
0x0000
0x10FF
0x1100
0x7FFF
0x8000
0x90FF
0x9100
0xFFFF
AVR Memory Map
Internal Memory
External
(Unused)
Memory
Memory Configuration A
External 32K SRAM
0x0000
0x10FF
0x1100
0x7FFF
0x0000
0x0FFF
0x1000
0x7FFF
0x8000
0x8FFF
0x9000
0xFFFF
AVR Memory Map
Internal Memory
External
(Unused)
Memory
Memory Configuration B
ATmega128A
External 32K SRAM
Figure
0x0000
0x0FFF
0x1000
0x7FFF
7-4, only
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