ST72321R6-Auto STMicroelectronics, ST72321R6-Auto Datasheet - Page 39

• 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
Crystal/ceramic oscillators
This family of oscillators has the advantage of producing a very accurate rate on the main
clock of the ST7. The selection within a list of four oscillators with different frequency ranges
has to be done by option byte in order to reduce consumption (refer to
configuration on page 223
multi-oscillator, the resonator and the load capacitors have to be placed as close as possible
to the oscillator pins in order to minimize output distortion and start-up stabilization time.
The loading capacitance values must be adjusted according to the selected oscillator.
These oscillators are not stopped during the RESET phase to avoid losing time in the
oscillator start-up phase.
Internal RC oscillator
This oscillator allows a low cost solution for the main clock of the ST7 using only an internal
resistor and capacitor. Internal RC oscillator mode has the drawback of a lower frequency
accuracy and should not be used in applications that require accurate timing.
In this mode, the two oscillator pins have to be tied to ground.
Table 10.
ST7 clock sources
for more details on the frequency ranges). In this mode of the
Doc ID 13829 Rev 1
Hardware configuration
C
L1
EXTERNAL
SOURCE
OSC1
OSC1
OSC1
CAPACITORS
LOAD
ST7
ST7
ST7
OSC2
OSC2
OSC2
Supply, reset and clock management
C
L2
Section 21.1.1: Flash
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