ST72F321AR6T6 STMicroelectronics, ST72F321AR6T6 Datasheet - Page 24

• Manufacturer Part Number: ST72F321AR6T6
• Description: MCU 8BIT 32KB FLASH 64TQFP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72F321AR6T6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 48
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 3.8 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Processor Series: ST72F3x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 1024 B
• Interface Type: I2C, SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 48
• Number Of Timers: 5
• Operating Supply Voltage: 3.8 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST7F521-IND/USB, ST7232X-EVAL, ST7MDT20-DVP3, ST7MDT20J-EMU3, ST7MDT20M-EMU3, STX-RLINK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 497-4842

ST72321Rx ST72321ARx ST72321Jx
6 SUPPLY, RESET AND CLOCK MANAGEMENT
The device includes a range of utility features for
securing the application in critical situations (for
example in case of a power brown-out), and re-
ducing the number of external components. An
overview is shown in
For more details, refer to dedicated parametric
section.
Main features
■
■
■
■
Figure 11. Clock, Reset and Supply Block Diagram
24/193
– 5 Crystal/Ceramic resonator oscillators
– 1 Internal RC oscillator
– Main supply Low voltage detection (LVD)
– Auxiliary Voltage detector (AVD) with interrupt
Optional PLL for multiplying the frequency by 2
(not to be used with internal RC oscillator)
Reset Sequence Manager (RSM)
Multi-Oscillator Clock Management (MO)
System Integrity Management (SI)
RESET
OSC2
OSC1
capability for monitoring the main supply or
the EVD pin
V
V
EVD
SS
DD
Figure
OSCILLATOR
RESET SEQUENCE
MULTI-
(MO)
MANAGER
(RSM)
11.
f
OSC
(option)
PLL
SICSR
AVD AVD AVD LVD
SYSTEM INTEGRITY MANAGEMENT
S
0
1
IE
6.1 PHASE LOCKED LOOP
If the clock frequency input to the PLL is in the
range 2 to 4 MHz, the PLL can be used to multiply
the frequency by two to obtain an f
MHz. The PLL is enabled by option byte. If the PLL
is disabled, then f
Caution: The PLL is not recommended for appli-
cations where timing accuracy is required. See
“PLL Characteristics” on page 151.
Figure 10. PLL Block Diagram
f
OSC
AVD Interrupt Request
AUXILIARY VOLTAGE
F
LOW VOLTAGE
RF
DETECTOR
DETECTOR
(AVD)
(LVD)
0
PLL x 2
0
/ 2
OSC2 =
0
WDG
f
RF
OSC2
f
OSC
PLL OPTION BIT
/2.
CLOCK (MCC/RTC)
WITH REALTIME
0
1
TIMER (WDG)
CONTROLLER
MAIN CLOCK
WATCHDOG
OSC2
f
OSC2
of 4 to 8
f
CPU