ST72321R6-Auto STMicroelectronics, ST72321R6-Auto Datasheet - Page 241

• Manufacturer Part Number: ST72321R6-Auto
• Description: 8-bit MCU for automotive with 32 Kbyte Flash, 10-bit ADC, timers, SPI, SCI and I2C interfaces
• Manufacturer: STMicroelectronics

Specifications of ST72321R6-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
22.3.2
22.3.3
22.3.4
22.3.5
22.3.6
22.3.7
Consequently, the LVD function is not guaranteed in the current silicon revision. For
complete security, an external reset circuit must be added.
LVD startup behavior
When the LVD is enabled, the MCU reaches its authorized operating voltage from a reset
state. However, in some devices, the reset state is released when V
between 0.8V and 1.5V. As a consequence, the I/Os may toggle when V
window.
This may be an issue especially for applications where the MCU drives power components.
Figure 108. LVD startup behavior
AVD not supported
On some devices with a specific V
cannot generate interrupts when V
Internal RC oscillator operation
Internal RC oscillator operation is not supported in ROM devices.
External clock source with PLL
External clock source is not supported with the PLL enabled.
Pull-up not present on PE2
Unlike ST72F321 Flash devices, ST72321 ROM devices have no weak pull-up on port PE2.
In LQFP44 ROM devices, the PE2 pad is not connected to an internal pull-up like other
unbonded pads. It is recommended to configure it as output push-pull to avoid added
current consumption.
Readout protection with LVD
The LVD is not supported if readout protection is enabled.
1.5V
0.8V
5V
V
IT+
Doc ID 13829 Rev 1
DD
DD
ramp up speed the AVD may not start. As a result it
rises and falls.
Window
LVD RESET
t
DD
is approximately
Known limitations
DD
is within this
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