ATAR080 datasheet(64/68 Pages) ATMEL

64 / 68 page

ATAR080

4675D–4BMCU–12/04

Figure 77. Output Low Current versus T

amb, VDD = 6.5 V, VOL = 0.2 × VDD

Emulation

The basic function of emulation is to test and evaluate the customer's program and

hardware in real time. This therefore enables the analysis of any timing, hardware or

software problem. For emulation purposes, all MARC4 controllers include a special

emulation mode. In this mode, the internal CPU core is inactive and the I/O buses are

available via Port 0 and Port 1 to allow an external access to the on-chip peripherals.

The MARC4 emulator uses this mode to control the peripherals of any MARC4 control-

ler (target chip) and emulates the lost ports for the application.

The MARC4 emulator can stop and restart a program at specified points during execu-

tion, making it possible for the applications engineer to view the memory contents and

those of various registers during program execution. The designer also gains the ability

to analyze the executed instruction sequences and all the I/O activities.

Figure 78. MARC4 Emulation

-40

-30

-20

-10

amb (°C)

max.

typ.

min.

MARC4 target chip

CORE

(inactive)

Application-specific hardware

Peripherals

MARC4 emulator

Program

memory

Trace

memory

Control

logic

Personal computer

CORE

MARC4

emulation-CPU

I/O control

I/O bus

Port 0

Port 1

SYSCL/

TCL,

TE, NRST

Emulation control

Emulator target board

ATAR080 Datasheet(PDF) 64 Page - ATMEL Corporation

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