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ST72734 Fiches technique(PDF) 27 Page - STMicroelectronics |
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ST72734 Fiches technique(HTML) 27 Page - STMicroelectronics |
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27 / 144 page ![]() ST72774/ST727754/ST72734 27/144 4 ON-CHIP PERIPHERALS 4.1 I/O PORTS 4.1.1 Introduction The I/O ports allow the transfer of data through digital inputs and outputs, and, for specific pins, the input of analog signals or the Input/Output of alternate signals for on-chip peripherals (DDC, TIMER...). Each pin can be programmed independently as digital input or digital output. Each pin can be an analog input when an analog switch is connected to the Analog to Digital Converter (ADC). Figure 15. I/O Pin Typical Circuit Note: This is the typical I/O pin configuration. For cost optimization, each port is customized with a specific configuration. DR DDR latch latch DR SEL DDR SEL VDD PAD Analog Switch (if required) Analog Enable (ADC) Alternate enable Alternate Enable Digital Enable Alternate enable Alternate Alternate Input PULL-UP (if required) output P-BUFFER (if required) N-BUFFER 1 0 1 0 VSS 5 |
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