ATA6020N ATMEL Corporation, ATA6020N Datasheet - Page 65

• Manufacturer Part Number: ATA6020N
• Description: Low-current Microcontroller For Watchdog Function
• Manufacturer: ATMEL Corporation

8.2
Figure 8-19. MARC4 Emulation
4708D–4BMCU–09/05
Emulation
Control
memory
memory
Program
logic
Trace
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 controller (target chip) and emulates the lost ports for the application.
The MARC4 emulator can stop and restart a program at specified points during execution, mak-
ing 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.
MARC4 emulator
Personal computer
emulation-CPU
Port 0
MARC4
CORE
Port 1
Emulation control
TE, NRST
I/O control
SYSCL/
I/O bus
TCL,
Application-specific hardware
Emulator target board
MARC4 target chip
(inactive)
Peripherals
CORE
ATA6020N
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