ATXMEGA32D4-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA32D4-CU

8/16-bit Atmel XMEGA D4 Microcontroller

Atmel Corporation 

XMEGA D4

by three. The return address is popped off the stack when returning from interrupts using the

RETI instruction, and from subroutine calls using the RET instruction.

The SP is decremented by one when data are pushed on the stack with the PUSH instruction,

and incremented by one when data is popped off the stack using the POP instruction.

To prevent corruption when updating the stack pointer from software, a write to SPL will auto-

matically disable interrupts for up to four instructions or until the next I/O memory write.

After reset the stack pointer is initialized to the highest address of the SRAM. See Figure 7-2 on

page 15.

6.8 Register File

The register file consists of 32 x 8-bit general purpose working registers with single clock cycle

access time. The register file supports the following input/output schemes:

• 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

Six of the 32 registers can be used as three 16-bit address register pointers for data space

addressing, enabling efficient address calculations. One of these address pointers can also be

used as an address pointer for lookup tables in flash program memory.

11

8135L–AVR–06/12

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