UM0034 datasheet(27/39 Pages) STMICROELECTRONICS

27 / 39 page

ST7-EMU3 series emulator

In-circuit communication configuration

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Isolation of the RESET pin

During an ICC session, you must ensure that the emulator controls the ST7’s RESET pin so

that no external reset is generated by the application. This can lead to a conflict if the

application reset circuitry signal exceeds 5mA (push-pull output or pull-up resistor <1k). To

avoid such conflicts, a Shottky diode can be used to isolate the application reset circuit.

ICCSEL/VPP pin

The application pull-down resistor must not be lower than 10 k

Ω.

ICCOSC pin

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 mode when programming, or the Start with External Clock (Ignore

Option Bytes) feature when debugging. In this case, the ICC Add-on provides a clock

source to initiate communication with the ST7. Your emulator with ICC Add-on provides a

clock source at a frequency of 8 MHz.

For ST7 devices with multi-oscillator capability, when the ICCOSC pin is connected, the

OSC2 pin should be grounded.

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 mode and

when starting your ICD session it is not necessary to use the Start with External Clock

(Ignore Option Bytes) feature in STVD7. In this case, your application clock source

provides the clock signal for initiating communication with your ST7 and ICCOSC is not

connected to your ST7.

VDD_APPLI pin

Not connected as EMU3 emulator’s power supply follower is not used with the ICC Add-on.

ICC cable

Your EMU3 emulator includes a 30cm long ICC cable for connecting to the ICC connector

on your application board. You can use a cable up to 2 meters long.

Table 4.

Typical ICC cable characteristics

Characteristic

Typical measurement

ICC cable image

Pitch

1.27 mm

Section

0.09 mm2

Impedance

100 Ohms

Nominal Voltage

300 V

Max. Current

1 A

Temperature

-10°C to +105° C

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