ATMEGA644PV-20AU Atmel, ATMEGA644PV-20AU Datasheet - Page 14
![IC MCU AVR 64K FLASH 44-TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644PV-20AU
Manufacturer Part Number
ATMEGA644PV-20AU
Description
IC MCU AVR 64K FLASH 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644PV-20AU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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4.5.1
4.5.2
4.6
8011O–AVR–07/10
Instruction Execution Timing
SPH and SPL – Stack Pointer High and Stack pointer Low
RAMPZ – Extended Z-pointer Register for ELPM/SPM
Note:
Table 4-2.
For ELPM/SPM instructions, the Z-pointer is a concatenation of RAMPZ, ZH, and ZL, as shown
in Figure 4-4. Note that LPM is not affected by the RAMPZ setting.
Figure 4-4.
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.
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 4-5 on page 15
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
0x3E (0x5E)
0x3D (0x5D)
Read/Write
Initial Value
Bit
0x3B (0x5B)
Read/Write
Initial Value
Bit (Individually)
Bit (Z-pointer)
1. Initial values respectively for the ATmega164P/324P/644P.
Stack Pointer size
The Z-pointer used by ELPM and SPM
RAMPZ7
R/W
R/W
SP7
15
7
0
R
–
7
0
1
ATmega164P
ATmega324P
ATmega644P
23
7
Device
shows the parallel instruction fetches and instruction executions enabled
RAMPZ6
R/W
SP6
R/W
RAMPZ
14
6
0
R
–
6
0
1
RAMPZ5
R/W
SP5
R/W
CPU
5
0
13
R
–
5
0
1
16
0
, directly generated from the selected clock source for the
RAMPZ4
0/0/1
R/W
SP12
SP4
R/W
R/W
4
0
12
4
1
(1)
15
7
ATmega164P/324P/644P
RAMPZ3
R/W
0/1/0
SP11
SP3
R/W
R/W
3
0
11
3
1
(1)
ZH
RAMPZ2
R/W
1/0/0
SP10
2
0
SP2
R/W
R/W
10
Stack Pointer size
2
1
(1)
0
8
SP[10:0]
SP[11:0]
SP[12:0]
RAMPZ1
R/W
SP9
SP1
R/W
R/W
1
0
9
1
0
1
7
7
RAMPZ0
R/W
SP8
SP0
R/W
R/W
0
0
8
0
0
1
ZL
RAMPZ
SPH
SPL
0
0
14
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