ATMEGA644PV ATMEL [ATMEL Corporation], ATMEGA644PV Datasheet - Page 20

• Manufacturer Part Number: ATMEGA644PV
• Description: 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

6.3.1
20
ATmega164P/324P/644P
Data Memory Access Times
The 32 general purpose working registers, 64 I/O registers, 160 Extended I/O Registers and the
1024/2048/4096 bytes of internal data SRAM in the ATmega164P/324P/644P are all accessible
through all these addressing modes. The Register File is described in
ter File” on page
Figure 6-2.
This section describes the general access timing concepts for internal memory access. The
internal data SRAM access is performed in two clk
Figure 6-3.
Address
clk
Data Memory Map
On-chip Data SRAM Access Cycles
Data
Data
WR
CPU
12.
RD
Compute Address
(1024/2048/4096 x 8)
160 Ext I/O Reg.
64 I/O Registers
Data Memory
Internal SRAM
32 Registers
T1
Memory Access Instruction
Address valid
CPU
T2
cycles as described in
$10FF
$0000 - $001F
$0020 - $005F
$0060 - $00FF
$0100
Next Instruction
T3
”General Purpose Regis-
Figure
8011D–AVR–02/07
6-3.