1 Getting Started ST7-EPB
10/15 UM0028 Rev 4
ICCOSC pin
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The ICCOSC pin of the ICC connector must be connected to the ST7’s OSC1 or OSCIN pin
if the clock is not provided by the application, or if the application clock source is not
programmed in the option byte. This connection allows you to start your ICP session using
the ICP OPT Disable programming mode. In this mode, your ST7-EPB provides a clock
source to initiate communication with the ST7 at a frequency of 16MHz.
For ST7 devices with multi-oscillator capability, when the ICCOSC pin is connected, the
OSC2 pin should be grounded.
Caution: For all versions of the following EPBs, the ICCOSC pin must not be connect to the device’s
OSCIN pin:
If your application provides a clock signal and you are certain that it is programmed in the
ST7’s option byte, you can start your ICP session using the ICP OPT Enable programming
mode. In this mode, your application clock source provides the clock signal for initiating
communication with your ST7 and ICCOSC is not connected to your ST7.
Your ST7-EPB programming board provides a clock signal when using both the ICP OPT
Disable and ICP OPT Enable programming modes. If you start your ICP session using ICP
OPT Enable, the clock signal provided by the programmer may conflict with the application
clock and can cause a communication failure with your ST7. To avoid this we recommend
installing a jumper on the connection between ICCOSC and the ST7. This jumper is
removed when starting in the ICP OPT Enable programming mode. If the user requires a
clock signal from the programming board in order to start in the ICP OPT Disable mode, the
jumper is left in place.
VDD_APPLI pin
This pin is used by the programming tool’s power supply follower, which adapts the voltage
of the tool’s signals to your application’s V
DD
.
The VDD_APPLI pin must be connected when using any ST7MDTxx-EPB programmer with
ICP capability,
except
the ST7MDTS1-EPB.
1.5 Additional information about programming in ISP mode
Before programming the OSCx option bits, make sure you have chosen the right options
configuration.The OSCx option bits are very important. If you program the wrong OSCx
option bits, depending on your hardware configuration, you may not be able to reprogram
the device in ISP mode.
•
ST7MDTU2-EPB
• ST7MDTU3-EPB
• ST7MDTU5-EPB
