STV3550B STMicroelectronics, STV3550B Datasheet - Page 90

• Manufacturer Part Number: STV3550B
• Manufacturer: STMicroelectronics

Specifications of STV3550B

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

TV chassis control
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7.1
7.1.1
7.1.2
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PWM and counter module
TV chassis control
The STV3550 includes the following peripherals for TV chassis control:
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This module contains two separate functions:
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External interface
Table 25.
PWM functions
The pulse width signal generator is used for the digital generation of up to four analog
outputs when used with an external filtering network.
The unit, based on a unique 8-bit free-running counter clocked by the 27 MHz clock, can be
prescaled by a 4-bit prescaler and provide frequencies from 6591.8 Hz up to 105468.75 Hz.
Four 8-bit comparators are used to select 4 aspect ratios for the same PWM frequency. The
period of the four 8-bit PWMs is therefore identical and synchronized.
The four PWM outputs must be configured as alternate function output push-push or open
drain.
An interrupt can be generated at the counter overflow.
131
133
10
11
Pin number
30 fully-programmable I/Os
Four external interrupts
8-bit programmable PWM with 4 inputs/outputs
Infrared digital preprocessor
Real time clock and watchdog timer
Four 16-bit basic timers
10-bit ADC with 6 inputs and wake-up capability
Two master/slave I²C bus interface
UART and support for IrDA interfaces
Pulse width modulation (PWM) decoder linked to 4 PWM outputs
A 32-bit counter with 4 input capture and compare capabilities
Parallel I/O pins
PORTA0
PORTA1
PORTA2
PORTA3
Pin name
Port A0
Port A1
Port A2
Port A3
Main function
(after reset)
PWMCAPTURE0/PWM0
PWMCAPTURE1/PWM1
PWMCAPTURE2/PWM2
PWMCAPTURE3/PWM3
Alternate function
STV3550