atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 18

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

described in detail in
“Memory Programming” on page
365.
“Memory Programming” on page
365
contains a detailed description on Flash data serial downloading using the SPI pins or the
JTAG interface.
Constant tables can be allocated within the entire program memory address space (see the LPM
– Load Program Memory instruction description and ELPM - Extended Load Program Memory
instruction description).
Timing diagrams for instruction fetch and execution are presented in
“Instruction Execution Tim-
ing” on page
13.
Figure 5-1.
Program Memory Map
Program Memory
0x00000
Application Flash Section
Boot Flash Section
0x7FFF (32KBytes)
5.2
SRAM Data Memory
Figure 5-2
shows how the ATmega32U4 SRAM Memory is organized.
The ATmega32U4 is a complex microcontroller with more peripheral units than can be sup-
ported within the 64 location reserved in the Opcode for the IN and OUT instructions. For the
Extended I/O space from $060 - $0FF in SRAM, only the ST/STS/STD and LD/LDS/LDD instruc-
tions can be used.
The first 2,816 Data Memory locations address both the Register File, the I/O Memory,
Extended I/O Memory, and the internal data SRAM. The first 32 locations address the Register
file, the next 64 location the standard I/O Memory, then 160 locations of Extended I/O memory
and the next 2,560 locations address the internal data SRAM.
The five different addressing modes for the data memory cover: Direct, Indirect with Displace-
ment, Indirect, Indirect with Pre-decrement, and Indirect with Post-increment. In the Register file,
registers R26 to R31 feature the indirect addressing pointer registers.
The direct addressing reaches the entire data space.
ATmega32U4
18
7766A–AVR–03/08