ATMEGA1281-16AU Atmel, ATMEGA1281-16AU Datasheet - Page 17
ATMEGA1281-16AU
Manufacturer Part Number
ATMEGA1281-16AU
Description
IC MCU AVR 128K FLASH 64-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA1281-16AU
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
54
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
8K 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, 64-VQFP
Cpu Family
ATmega
Device Core
AVR
Device Core Size
8b
Frequency (max)
16MHz
Interface Type
2-Wire/SPI/USART
Total Internal Ram Size
8KB
# I/os (max)
54
Number Of Timers - General Purpose
6
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
64
Package Type
TQFP
Processor Series
ATMEGA128x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
8 KB
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
54
Number Of Timers
6
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRRZ541, ATAVRRAVEN, ATAVRRZRAVEN, ATAVRRZUSBSTICK, ATAVRISP2, ATAVRRZ201
Minimum Operating Temperature
- 40 C
Controller Family/series
AVR MEGA
No. Of I/o's
54
Eeprom Memory Size
4KB
Ram Memory Size
8KB
Cpu Speed
16MHz
Rohs Compliant
Yes
For Use With
ATSTK600-TQFP64 - STK600 SOCKET/ADAPTER 64-TQFPATAVRDB101 - MODULE DISPLAY LCD/RGB BACKLIGHT770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEMATJTAGICE2 - AVR ON-CHIP D-BUG SYSTEM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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6.6.1
6.6.2
6.7
2549M–AVR–09/10
Instruction Execution Timing
RAMPZ – Extended Z-pointer Register for ELPM/SPM
EIND – Extended Indirect Register
For ELPM/SPM instructions, the Z-pointer is a concatenation of RAMPZ, ZH, and ZL, as shown
in Figure 6-4. Note that LPM is not affected by the RAMPZ setting.
Figure 6-4.
The actual number of bits is implementation dependent. Unused bits in an implementation will
always read as zero. For compatibility with future devices, be sure to write these bits to zero.
For EICALL/EIJMP instructions, the Indirect-pointer to the subroutine/routine is a concatenation
of EIND, ZH, and ZL, as shown in Figure 6-5. Note that ICALL and IJMP are not affected by the
EIND setting.
Figure 6-5.
The actual number of bits is implementation dependent. Unused bits in an implementation will
always read as zero. For compatibility with future devices, be sure to write these bits to zero.
This section describes the general access timing concepts for instruction execution. The AVR
CPU is driven by the CPU clock clk
chip. No internal clock division is used.
Figure 6-6 on page 18
by the Harvard architecture and the fast-access Register File concept. This is the basic pipelin-
ing concept to obtain up to 1 MIPS per MHz with the corresponding unique results for functions
per cost, functions per clocks, and functions per power-unit.
Bit
0x3B (0x5B)
Read/Write
Initial Value
Bit (
Individually)
Bit (Z-pointer)
Bit
0x3C (0x5C)
Read/Write
Initial Value
Bit (Individual-
ly)
Bit
pointer)
(Indirect-
RAMPZ7
EIND7
The Z-pointer used by ELPM and SPM
The Indirect-pointer used by EICALL and EIJMP
R/W
R/W
7
0
7
0
23
23
7
7
RAMPZ6
EIND6
shows the parallel instruction fetches and instruction executions enabled
R/W
R/W
EIND
RAMPZ
6
0
6
0
RAMPZ5
EIND5
R/W
R/W
ATmega640/1280/1281/2560/2561
16
5
0
5
0
0
16
0
CPU
, directly generated from the selected clock source for the
RAMPZ4
EIND4
R/W
R/W
4
0
4
0
15
7
15
7
RAMPZ3
EIND3
R/W
R/W
ZH
3
0
3
0
ZH
RAMPZ2
EIND2
R/W
R/W
2
0
2
0
0
8
0
8
RAMPZ1
EIND1
R/W
R/W
1
0
1
0
7
7
7
7
RAMPZ0
EIND0
R/W
R/W
ZL
0
0
0
0
ZL
RAMPZ
EIND
0
0
0
0
17
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