Phytec phyCORE-167CR, Hardware Manual

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The phyCORE-167CR/167CS on the phyCORE-Development Board
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PHYTEC Meßtechnik GmbH 2002 L-527e_8
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14.3.2 Activating the Bootstrap Loader
The Infineon C167Cx microcontroller contains an on-chip Bootstrap
Loader that provides basic communication and programming
functions. The combination of this Bootstrap Loader and the
corresponding FlashTools software installed on the PC allows for
Flash programming with application code via an RS-232 interface.
The Bootstrap Loader is also used by other third party toolpartner
software such as the Monitor166 from Keil or CrossView Pro ROM
monitor from Altium for debugging functions.
In order to start the on-chip Bootstrap Loader on the
phyCORE-167CR/167CS, the data line D4 of the microcontroller
must be connected to a low-level signal 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 X1C9 of the
phyCORE-167CR/167CS as the Boot input is high-active.
The phyCORE Development Board HD200 provides three different
options to activate the on-chip Bootstrap Loader:
1. The Boot button (S1) can be connected to VCC via Jumper JP28
which is located next the the Boot and Reset buttons at S1 and S2.
This configuration enables start-up of the on-chip Bootstrap
Loader 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 Bootstrap
Loader on the C167CR/C167CS
Table 25: JP28 Configuration of the Boot Button