ST72321R9-Auto STMicroelectronics, ST72321R9-Auto Datasheet - Page 31

• Manufacturer Part Number: ST72321R9-Auto
• Description: 8-bit MCU for automotive with 60 Kbyte Flash, 10-bit ADC, timers, SPI, SCI and I2C interfaces
• Manufacturer: STMicroelectronics

Specifications of ST72321R9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

ST72321xx-Auto
Figure 6.
1. If the ICCCLK or ICCDATA pins are only used as outputs in the application, no signal isolation is necessary. As soon as the
2. During the ICC session, the programming tool must control the RESET pin. This can lead to conflicts between the
3. The use of Pin 7 of the ICC connector depends on the programming tool architecture. This pin must be connected when
4. Pin 9 has to be connected to the OSC1 or OSCIN pin of the ST7 when the clock is not available in the application or if the
4.5
APPLICATION
POWER SUPPLY
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
implemented in case another device forces the signal. Refer to the programming tool documentation for recommended
resistor values.
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.
using most ST programming tools (it is used to monitor the application power supply). Please refer to the programming tool
manual.
selected clock option is not programmed in the option byte. ST7 devices with multi-oscillator capability need to have OSC2
grounded in this case.
Typical ICC interface
ICP (in-circuit programming)
To perform ICP the microcontroller must be switched to ICC (in-circuit communication) mode
by an external controller or programming tool.
Depending on the ICP code downloaded in RAM, Flash memory programming can be fully
customized (number of bytes to program, program locations, or selection serial
communication interface for downloading).
When using an STMicroelectronics or third-party programming tool that supports ICP and
the specific microcontroller device, the user needs only to implement the ICP hardware
interface on the application board (see
to the device pinout description.
(See Note 3)
PROGRAMMING TOOL
C
L2
OPTIONAL
(See Note 4)
C
ST7
L1
Doc ID 13829 Rev 1
10k
ICC CONNECTOR
10
9
Figure
7
8
5
6
6). For more details on the pin locations, refer
ICC Cable
4
3
1
2
HE10 CONNECTOR TYPE
ICC CONNECTOR
APPLICATION BOARD
Flash program memory
APPLICATION
See Note 2
APPLICATION
RESET SOURCE
See Note 1
I/O
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