OP196 datasheet(77/88 Pages) AD

77 / 88 page

ADuC841/ADuC842/ADuC843

Rev. 0 | Page 77 of 88

Note that PSEN is normally an output (as described in the

External Memory Interface section) and is sampled as an input

only on the falling edge of RESET, i.e., at power-up or upon an

external manual reset. Note also that if any external circuitry

unintentionally pulls PSEN low during power-up or reset

events, it could cause the chip to enter download mode and

therefore fail to begin user code execution as it should. To pre-

vent this, ensure that no external signals are capable of pulling

the PSEN pin low, except for the external PSEN jumper itself.

Embedded Serial Port Debugger

From a hardware perspective, entry into serial port debug mode

is identical to the serial download entry sequence described in

the preceding section. In fact, both serial download and serial

port debug modes can be thought of as essentially one mode of

operation used in two different ways. Note that the serial port

debugger is fully contained on the part (unlike ROM monitor

type debuggers), and therefore no external memory is needed to

enable in-system debug sessions.

Single-Pin Emulation Mode

Also built into the part is a dedicated controller for single-pin

in-circuit emulation (ICE) using standard production ADuC841/

ADuC842/ADuC843 devices. In this mode, emulation access is

gained by connection to a single pin, the EA pin. Normally, this

pin is hardwired either high or low to select execution from

internal or external program memory space, as described

earlier. To enable single-pin emulation mode, however, users

need to pull the EA pin high through a 1 kΩ resistor, as shown

in Figure 85. The emulator then connects to the 2-pin header

also shown in Figure 85. To be compatible with the standard

connector that comes with the single-pin emulator available

from Accutron Limited (www.accutron.com), use a 2-pin

0.1 inch pitch friction lock header from Molex (www.molex.com)

such as their part number 22-27-2021. Be sure to observe the

polarity of this header. As represented in Figure 85, when the

friction lock tab is at the right, the ground pin should be the

lower of the two pins (when viewed from the top).

Typical System Configuration

The typical configuration shown in Figure 85 summarizes some

of the hardware considerations that were discussed in previous

sections.

DEVELOPMENT TOOLS

There are two models of development tools available for the

ADuC841/ADuC842/ADuC843:

•

QuickStartTM—Entry-level development system

•

QuickStart Plus—Comprehensive development system

These systems are described briefly in the following sections.

QUICKSTART DEVELOPMENT SYSTEM

The QuickStart Development System is an entry-level, low cost

development tool suite supporting the parts. The system

consists of the following PC based (Windows® compatible)

hardware and software development tools.

Hardware

Evaluation board and serial port

programming cable.

Software

Serial download software.

Miscellaneous

CD-ROM documentation and prototype

device.

A brief description of some of the software tools and

components in the QuickStart Development System follows.

Download—In-Circuit Serial Downloader

The serial downloader is a Windows application that allows the

user to serially download an assembled program (Intel® hexadeci-

mal format file) to the on-chip program flash memory via the

serial COM1 port on a standard PC. Application Note uC004

details this serial download protocol and is available from

www.analog.com/microconverter.

ASPIRE—IDE

The ASPIRE integrated development environment is a Windows

application that allows the user to compile, edit, and debug code

in the same environment. The ASPIRE software allows users to

debug code execution on silicon using the MicroConverter

UART serial port. The debugger provides access to all on-chip

peripherals during a typical debug session as well as single step,

animate, and break-point code execution control.

Note that the ASPIRE IDE is also included as part of the

QuickStart Plus System. As part of the QuickStart Plus System,

the ASPIRE IDE also supports mixed level and C source debug.

This is not available in the QuickStart System, but there is an

example project that demonstrates this capability.

QuickStart Plus Development System

The QuickStart Plus Development System offers users enhanced

nonintrusive debug and emulation tools. The system consists of

the following PC based (Windows compatible) hardware and

software development tools.

Hardware

Prototype Board. Accutron Nonintrusive

Single-Pin Emulator.

Software

ASPIRE Integrated Development

Environment. Features full C and assembly

emulation using the Accutron single pin

emulator.

Miscellaneous

CD-ROM documentation.

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