phyCORE-LPC2292/94
86
©
PHYTEC Meßtechnik GmbH 2006 L-658e_5
16.3.2
Starting the ISP Command Handler
The Philips LPC229x microcontroller family contains an on-chip boot
loader that provides both In-System (ISP) and In-Application
programming (IAP) interfaces. The loader can execute an ISP
command handler or the user application. The combination of this ISP
handler and the corresponding LPC2000 Flash Utility software
installed on the PC allows for on-chip Flash programming with
application code via an RS-232 interface.
In order to start the ISP command handler on the
phyCORE-LPC2292/94, port P0.14 of the microcontroller must be
connected to a low signal level at the time the Reset signal changes
from its active to the inactive state. This is achieved by applying a
high-level signal at pin X700C9 (BOOT) of the
phyCORE-LPC2292/94. A transistor circuitry connects P0.14 to GND
as long as the BOOT pin is high. An on-board pull-up resistor (R213)
ensures a high level at P0.14 if the BOOT signal is not active.
Refer to
the Philips LPC229x User Manual, section 20 for more details.
The phyCORE Carrier Board HD200 provides two different options to
activate the ISP mode:
1.
The Boot button (S_1) can be connected to VCC via Jumper JP28
which is located next to the Boot and Reset buttons at S_1 and S_2.
This configuration enables start-up of the ISP command handler if
the Boot button is pressed during a hardware reset or
power-on.
Jumper Setting
Description
JP28
6 + 8
and
3 + 4
Boot button (in conjunction with Reset button or
connection of the power supply) starts the ISP mode on
the LPC2292/94
Table 48:
JP28 Configuration of the Boot Button
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