ST72F324BJ STMICROELECTRONICS [STMicroelectronics], ST72F324BJ Datasheet - Page 20

• Manufacturer Part Number: ST72F324BJ
• Description: 8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Flash program memory
4.4
Caution:
20/188
ICC interface
ICC needs a minimum of 4 and up to 6 pins to be connected to the programming tool (see
Figure
Figure 8.
1. If the ICCCLK or ICCDATA pins are only used as outputs in the application, no signal isolation is
2. During the ICC session, the programming tool must control the RESET pin. This can lead to conflicts
3. The use of Pin 7 of the ICC connector depends on the programming tool architecture. This pin must be
4. Pin 9 has to be connected to the OSC1 (OSCIN) pin of the ST7 when the clock is not available in the
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.
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.
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.
connected when using most ST programming tools (it is used to monitor the application power supply).
Please refer to the programming tool manual.
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.
–
–
–
–
–
–
–
Application
power supply
8). These pins are:
RESET: device reset
V
ICCCLK: ICC output serial clock pin
ICCDATA: ICC input/output serial data pin
ICCSEL/V
OSC1 (or OSCIN): main clock input for external source (optional)
V
SS
DD
Typical ICC interface
: device power supply ground
: application board power supply (optional, see
(See note 3)
PP
Programming tool
Mandatory for
8/16 Kbyte Flash devices
(see note 4)
: programming voltage
ST7
10kΩ
10
9
ICC connector
7
8
5
6
ICC cable
4
3
1
2
Figure
HE10 connector type
ICC connector
reset source
Application board
Application
See note 2
8, Note 3).
Application
See note 1
I/O
ST72324B