ATmega324PA datasheet(21/468 Pages) ATMEL

部品番号	ATmega324PA

部品情報	8-bit Microcontroller with 16/32/64/128K Bytes In-Sytem Programmable Flash

PDF	468 Pages

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メーカー	ATMEL [ATMEL Corporation]

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8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

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 ATmega164PA/324PA/644PA/1284P are all

accessible through all these addressing modes. The Register File is described in ”General Pur-

pose Register File” on page 13.

Figure 7-2.

Data Memory Map for ATmega164PA/324PA/644PA/1284P

7.3.1

Data Memory Access Times

This section describes the general access timing concepts for internal memory access. The

internal data SRAM access is performed in two clk

CPU cycles as described in Figure 7-3.

Figure 7-3.

On-chip Data SRAM Access Cycles

32 Registers

64 I/O Registers

Internal SRAM

(1024/2048/4096/16384x 8)

0x0000 - 0x001F

0x0020 - 0x005F

0x04FF/0x08FF/0x10FF/0x40FF

0x0060 - 0x00FF

Data Memory

160 Ext I/O Reg.

0x0100

clk

Data

Address

Address valid

Compute Address

CPU

Memory Access Instruction

Next Instruction

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