ST72324BJ2 datasheet(20/188 Pages) STMICROELECTRONICS

20 / 188 page

Flash program memory

ST72324B

20/188

4.4

ICC interface

ICC needs a minimum of 4 and up to 6 pins to be connected to the programming tool (see

Figure 8). These pins are:

–

RESET: device reset

–VSS: device power supply ground

–

ICCCLK: ICC output serial clock pin

–

ICCDATA: ICC input/output serial data pin

–

ICCSEL/VPP: programming voltage

–

OSC1 (or OSCIN): main clock input for external source (optional)

–VDD: application board power supply (optional, see Figure 8, Note 3).

Figure 8.

Typical ICC interface

If the ICCCLK or ICCDATA pins are only used as outputs in the application, no signal isolation is

necessary. As soon as the programming tool is plugged to the board, even if an ICC session is not in

progress, the ICCCLK and ICCDATA pins are not available for the application. If they are used as inputs by

the application, isolation such as a serial resistor has to be implemented in case another device forces the

signal. Refer to the Programming Tool documentation for recommended resistor values.

During the ICC session, the programming tool must control the RESET pin. This can lead to conflicts

between the programming tool and the application reset circuit if it drives more than 5mA at high level

(PUSH-pull output or pull-up resistor <1K). A schottky diode can be used to isolate the application reset

circuit in this case. When using a classical RC network with R>1K or a reset management IC with open

drain output and pull-up resistor >1K, no additional components are needed. In all cases the user must

ensure that no external reset is generated by the application during the ICC session.

The use of Pin 7 of the ICC connector depends on the programming tool architecture. This pin must be

connected when using most ST programming tools (it is used to monitor the application power supply).

Please refer to the programming tool manual.

Pin 9 has to be connected to the OSC1 (OSCIN) pin of the ST7 when the clock is not available in the

application or if the selected clock option is not programmed in the option byte. ST7 devices with multi-

oscillator capability need to have OSC2 grounded in this case.

Caution:

External clock ICC entry mode is mandatory in ST72F324B 8/16 Kbyte Flash devices. In

this case pin 9 must be connected to the OSC1 (OSCIN) pin of the ST7 and OSC2 must be

grounded. 32 Kbyte Flash devices may use external clock or application clock ICC entry

mode.

ICC connector

HE10 connector type

Application

power supply

Programming tool

ICC connector

Application board

ICC cable

(See note 3)

10k

Ω

ST7

Mandatory for

See note 1

See note 2

Application

reset source

Application

I/O

(see note 4)

8/16 Kbyte Flash devices

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