ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 11

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

General Purpose
Register File
2490G–AVR–03/04
• Bit 0 – C: Carry Flag
The Carry Flag C indicates a carry in an arithmetic or logic operation. See the “Instruc-
tion Set Description” for detailed information.
The Register File is optimized for the AVR Enhanced RISC instruction set. In order to
achieve the required performance and flexibility, the following input/output schemes are
supported by the Register File:
•
•
•
•
Figure 4 shows the structure of the 32 general purpose working registers in the CPU.
Figure 4. AVR CPU General Purpose Working Registers
Most of the instructions operating on the Register File have direct access to all registers,
and most of them are single cycle instructions.
As shown in Figure 4, each register is also assigned a data memory address, mapping
them directly into the first 32 locations of the user data space. Although not being physi-
cally implemented as SRAM locations, this memory organization provides great
flexibility in access of the registers, as the X-, Y-, and Z-pointer registers can be set to
index any register in the file.
One 8-bit output operand and one 8-bit result input.
Two 8-bit output operands and one 8-bit result input.
Two 8-bit output operands and one 16-bit result input.
One 16-bit output operand and one 16-bit result input.
Registers
Purpose
Working
General
7
R13
R14
R15
R16
R17
R26
R27
R28
R29
R30
R31
R0
R1
R2
…
…
0
Addr.
0x0D
0x0E
0x0F
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x00
0x01
0x02
0x10
0x11
ATmega64(L)
X-register High Byte
Y-register High Byte
Z-register High Byte
X-register Low Byte
Y-register Low Byte
Z-register Low Byte
11