UPSD3234A-40U6T STMicroelectronics, UPSD3234A-40U6T Datasheet - Page 54

• Manufacturer Part Number: UPSD3234A-40U6T
• Description: IC MCU 8032 64KB FLASH 80TQFP
• Manufacturer: STMicroelectronics
• Series: µPSDr

Specifications of UPSD3234A-40U6T

• Core Processor: 8032
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, UART/USART, USB
• Peripherals: LVR, POR, PWM, WDT
• Number Of I /o: 46
• Program Memory Size: 288KB (288K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Oscillator
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Oscillator
The oscillator circuit of the UPSD323xx devices is a single stage inverting amplifier in a
Pierce oscillator configuration. The circuitry between XTAL1 and XTAL2 is basically an
inverter biased to the transfer point. Either a crystal or ceramic resonator can be used as the
feedback element to complete the oscillator circuit. Both are operated in parallel resonance.
XTAL1 is the high gain amplifier input, and XTAL2 is the output. To drive the UPSD323xx
devices externally, XTAL1 is driven from an external source and XTAL2 left open-circuit.
Figure 18. Oscillator
XTAL1
8 to 40 MHz
UPSD3234A, UPSD3234BV, UPSD3233B, UPSD3233BV
XTAL2
XTAL1
External Clock
XTAL2
AI06620