AN1446 Datasheet, PDF (1/3 Pages) STMicroelectronics – USING THE ST72521 EMULATOR TO DEBUG A ST72324 TARGET APPLICATION

AN1446
APPLICATION NOTE
USING THE ST72521 EMULATOR TO DEBUG A ST72324
TARGET APPLICATION
by Microcontroller Division Applications
1 PURPOSE AND SCOPE OF THIS DOCUMENT
The ST72521 emulator is able to support development of software for the ST72324 target
MCU because the ST72521 and ST72324 are essentially compatible. The purpose of this doc-
ument is to highlight the differences so you can write software which will run without modifica-
tion on both the ST72521 emulator and the ST72324 target. Only functional aspects will be
covered. Electrical characteristics and Flash programming aspects that cannot be tested on
the emulator are not covered by this document. Due to the fact that the ST72521 emulator has
been delivered in two versions, this document is divided into 2 sections corresponding to the
following emulator versions and ST72324 silicon version.
Table 1. List of Emulator and Target MCU versions
ST72521 Emulator chip version
1
Cut 1.3
2
Cut 1.6
ST72324 Chip Version
Cut 1.0
Cut 1.0
2 ST72521 CUT 1.3 VERSUS ST72324 CUT 1.0
This section describes all the differences between the emulator device and the target device
and describes the impact on your software, that is how you need to implement your software
so it will run without change in both the emulator and the target chip.
2.1 SCHMITT TRIGGERS
Description: On the ST72521 emulator chip cut 1.3, there is no Schmitt Trigger hysteresis
(Vil=Vih) on pins which have no Alternate Function Input.
Impact on Software: The Schmitt Trigger cannot be debugged on this version of the emu-
lator. No impact on software.
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