Rainbow-electronics ATmega161L Bedienungsanleitung PDF herunterladen (Seite 17)

ATmega161(L)

1228C–AVR–08/02

Program execution continues at address contained by the Z-register (i.e., the PC is

loaded with the contents of the Z-register).

Relative Program Addressing,

RJMP and RCALL

Figure 19. Relative Program Memory Addressing

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

2047.

Direct Program Addressing,

JMP and CALL

Figure 20. Direct Program Addressing

Program execution continues at the address immediate in the instruction words.

Memory Access Times

and Instruction

Execution Timing

This section describes the general access timing concepts for instruction execution and

internal memory access.

TheAVRCPUisdrivenbytheSystemClockØ, directly generated from the external

clock crystal for the chip. No internal clock division is used.

Figure 21 shows the parallel instruction fetches and instruction executions enabled by

the Harvard architecture and the fast-access Register File concept. This is the basic

pipelining concept to obtain up to 1 MIPS per MHz with the corresponding unique results

for functions per cost, functions per clocks and functions per power unit.

$1FFF

$000

PROGRAM MEMORY

15 12 11

OP k

21 20

15 0

16 LSBs

PROGRAM MEMORY

$0000

$1FFF

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 158 159

Keine Kommentare

Rainbow-electronics ATmega161L Bedienungsanleitung Seite 17