
Integration Manual
HW 86010
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© Höft & Wessel AG
page 28/46
AM
30.07.04
1.22
IM86010-1-22_.doc
Subject to amendment, errors excepted
3.4.6.5
Activation of download mode
During any reset (internal or external) interface signals BOOT0 and BOOT1
overload the normal function of these signals (CTSO and DSRO). They are
used to select between normal start of the firmware and firmware download
mode.
BOOT0
BOOT1
Function
LOW
LOW
Enable firmware download mode
LOW
HIGH
Reserved for future use
HIGH
LOW
Reserved for future use
HIGH
HIGH
Normal start of the firmware
BOOT0 and BOOT1 are latched at the rising edge of RSTNO. The signals
have internal 10 k
Ω
pull-ups. So they may be left unconnected, if not used.
HW 86010 evaluates these signals on every reset (including internal
resets). In order to avoid unwanted switches to firmware download mode,
the host device shall take care that theses signals are driven low only
together with RSTBI driven low.
The evaluation kit HW 86910 contains adapter boards that support firmware
download from a standard PC through a normal COM port. The evaluation
kit contains further information on firmware download and a loader software
for PC Windows-NT/95/98.
Содержание HW 86010
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