ATTINY12(2003) Ver la hoja de datos (PDF) - Atmel Corporation

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ATTINY12
(Rev.:2003)

8-bit Microcontroller with 1K Byte Flash

Atmel Corporation 

Relative Program Addressing, Figure 12. Relative Program Memory Addressing

RJMP and RCALL

+1

Constant Addressing Using

the LPM Instruction

Program execution continues at address PC + k + 1. The relative address k is -2048 to

2047.

Figure 13. Code Memory Constant Addressing

15

10

Z-REGISTER

PROGRAM MEMORY

$000

$1FF

Constant byte address is specified by the Z-register contents. The 15 MSBs select word

address (0 - 511), the LSB selects low byte if cleared (LSB = 0) or high byte if set

(LSB = 1).

Subroutine and Interrupt

Hardware Stack

The ATtiny11/12 uses a 3-level-deep hardware stack for subroutines and interrupts. The

hardware stack is 9 bits wide and stores the program counter (PC) return address while

subroutines and interrupts are executed.

RCALL instructions and interrupts push the PC return address onto stack level 0, and

the data in the other stack levels 1-2 are pushed one level deeper in the stack. When a

RET or RETI instruction is executed the returning PC is fetched from stack level 0, and

the data in the other stack levels 1-2 are popped one level in the stack.

If more than three subsequent subroutine calls or interrupts are executed, the first val-

ues written to the stack are overwritten. Pushing four return addresses A1, A2, A3, and

A4, followed by four subroutine or interrupt returns, will pop A4, A3, A2, and once more

A2 from the hardware stack.

12 ATtiny11/12

1006D–AVR–07/03

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