ATMEGA2561-16AI Atmel, ATMEGA2561-16AI Datasheet - Page 17
ATMEGA2561-16AI
Manufacturer Part Number
ATMEGA2561-16AI
Description
IC AVR MCU 256K 16MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA2561-16AI
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
256KB (128K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Manufacturer
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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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