ATAM862-8 Datasheet, PDF (98/107 Pages) ATMEL Corporation – Microcontroller with UHF ASK/FSK Transmitter

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 94. MARC4 Emulation
MARC4 emulator
Program
memory
MARC4
emulation-CPU
Trace
memory
CORE
Control
logic
Port 0 Port 1
Emulator target board
MARC4 target chip
I/O bus
I/O control
CORE
(inactive)
Emulation control
SYSCL/
TCL,
TE, NRST
Peripherals
Application-specific hardware
Personal computer
98 ATAM862-8
4590E–4BMCU–09/04