ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 11

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

7.4
9223B–AVR–09/11
General Purpose Register File
• Bit 1 – Z: Zero Flag
The Zero Flag Z indicates a zero result in an arithmetic or logic operation. See the “Instruction
Set Description” for detailed information.
• Bit 0 – C: Carry Flag
The Carry Flag C indicates a carry in an arithmetic or logic operation. See the “Instruction 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:
• 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
Figure 7-2
Figure 7-2.
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
directly into the first 32 locations of the user Data Space. Although not being physically imple-
mented 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.
Atmel ATmega48PA/88PA/168PA [Preliminary]
Registers
Purpose
General
Working
shows the structure of the 32 general purpose working registers in the CPU.
Figure
AVR CPU General Purpose Working Registers
7-2, each register is also assigned a data memory address, mapping them
7
R13
R14
R15
R16
R17
R26
R27
R28
R29
R30
R31
R0
R1
R2
…
…
0
Addr.
0x0D
0x1A
0x1B
0x1C
0x1D
0x1E
0x00
0x01
0x02
0x0E
0x0F
0x10
0x11
0x1F
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