UPSD3234A-40U6T STMicroelectronics, UPSD3234A-40U6T Datasheet - Page 80

• 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: -

Pulse width modulation (PWM)
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Pulse width modulation (PWM)
The PWM block has the following features:
●
●
●
4-channel PWM unit (PWM 0-3)
The 8-bit counter of a PWM counts module 256 (i.e., from 0 to 255, inclusive). The value
held in the 8-bit counter is compared to the contents of the Special Function Register (PWM
0-3) of the corresponding PWM. The polarity of the PWM outputs is programmable and
selected by the PWML Bit in PWMCON register. Provided the contents of a PWM 0-3
register is greater than the counter value, the corresponding PWM output is set HIGH (with
PWML = 0). When the contents of this register is less than or equal to the counter value, the
corresponding PWM output is set LOW (with PWML = 0). The pulse-width-ratio is therefore
defined by the contents of the corresponding Special Function Register (PWM 0-3) of a
PWM. By loading the corresponding Special Function Register (PWM 0-3) with either 00H
or FFH, the PWM output can be retained at a constant HIGH or LOW level respectively (with
PWML = 0).
For each PWM unit, there is a 16-bit Prescaler that are used to divide the main system clock
to form the input clock for the corresponding PWM unit. This prescaler is used to define the
desired repetition rate for the PWM unit. SFR registers B1h - B2h are used to hold the 16-bit
divisor values.
The repetition frequency of the PWM output is given by:
And the input clock frequency to the PWM counters is = f
See
pin as PWM output.
Section 7: I/O ports (MCU module)
Four-channel, 8-bit PWM unit with 16-bit prescaler
One-channel, 8-bit unit with programmable frequency and pulse width
PWM Output with programmable polarity
fPWM
8
= (f
OSC
/ prescaler0) / (2 x 256)
UPSD3234A, UPSD3234BV, UPSD3233B, UPSD3233BV
for more information on how to configure the Port 4
OSC
/ 2 / (prescaler data value + 1)