1 Getting Started

ST7-EPB

10/15

UM0028 Rev 4

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

The VDD_APPLI pin must be connected when using any ST7MDTxx-EPB programmer with

ICP capability,

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.