ATmega128A Atmel Corporation, ATmega128A Datasheet - Page 23

• Manufacturer Part Number: ATmega128A
• Manufacturer: Atmel Corporation

Specifications of ATmega128A

• Flash (kbytes): 128 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

7.5.3
7.5.4
8151H–AVR–02/11
ATmega103 Compatibility
Using the External Memory Interface
Figure 7-4.
Note:
Both External Memory Control Registers (XMCRA and XMCRB) are placed in Extended I/O
space. In ATmega103 compatibility mode, these registers are not available, and the features
selected by these registers are not available. The device is still ATmega103 compatible, as
these features did not exist in ATmega103. The limitations in ATmega103 compatibility mode
are:
The interface consists of:
• Only two wait-states settings are available (SRW1n = 0b00 and SRW1n = 0b01).
• The number of bits that are assigned to address high byte are fixed.
• The External Memory section can not be divided into sectors with different wait-state
• Bus-keeper is not available.
• RD, WR and ALE pins are output only (Port G in ATmega128A).
• AD7:0: Multiplexed low-order address bus and data bus.
• A15:8: High-order address bus (configurable number of bits).
• ALE: Address latch enable.
settings.
External Memory
Atmel
available (Memory Configuration B N/A)
ATmega128A in ATmega103 compatibility mode: Memory Configuration B is available (Memory
Configuration A N/A)
(0-60K x 8)
®
External Memory with Sector Select
AVR
®
Memory Configuration A
ATmega128A in non ATmega103 compatibility mode: Memory Configuration A is
Internal memory
Lower sector
Upper sector
SRW01
SRW00
SRW11
SRW10
0x0000
0x10FF
0x1100
0xFFFF
SRL[2..0]
External Memory
(0-60K x 8)
Memory Configuration B
Internal memory
SRW10
ATmega128A
0x0000
0x0FFF
0x1000
0xFFFF
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