ST7260E1 STMicroelectronics, ST7260E1 Datasheet - Page 19

• Manufacturer Part Number: ST7260E1
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 8K FLASH/ROM AND SERIAL COMMUNICATION INTERFACE (SCI)
• Manufacturer: STMicroelectronics

Specifications of ST7260E1

• 4 Or 8 Kbytes Program Memory: high density Flash (HDFlash), or FastROM with readout and write protection

ST7260xx
5.4
ICC interface
ICC needs a minimum of 4 and up to 6 pins to be connected to the programming tool (see
Figure
Figure 6.
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
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
6). 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 (see
(See note 3)
PP
Programming tool
Optional
(see note 4)
: programming voltage
ST7
10kΩ
10
9
ICC connector
7
8
5
6
ICC cable
Figure
4
3
1
2
6, Note 3).
HE10 connector type
ICC connector
Flash program memory
reset source
Application board
See note 2
Application
Application
See note 1
I/O
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