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ST10F273Z4 Datasheet(PDF) 64 Page - STMicroelectronics |
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ST10F273Z4 Datasheet(HTML) 64 Page - STMicroelectronics |
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64 / 188 page  Parallel ports ST10F273Z4 64/188 13 Parallel ports 13.1 Introduction The ST10F273Z4 MCU provides up to 111 I/O lines with programmable features. These capabilities bring very flexible adaptation of this MCU to wide range of applications. ST10F273Z4 has nine groups of I/O lines gathered as follows: ● Port 0 is a two time 8-bit port named P0L (Low as less significant byte) and P0H (high as most significant byte) ● Port 1 is a two time 8-bit port named P1L and P1H ● Port 2 is a 16-bit port ● Port 3 is a 15-bit port (P3.14 line is not implemented) ● Port 4 is a 8-bit port ● Port 5 is a 16-bit port input only ● Port 6, Port 7 and Port 8 are 8-bit ports These ports may be used as general purpose bidirectional input or output, software controlled with dedicated registers. For example, the output drivers of six of the ports (2, 3, 4, 6, 7, 8) can be configured (bit- wise) for push-pull or open drain operation using ODPx registers. The input threshold levels are programmable (TTL/CMOS) for all the ports. The logic level of a pin is clocked into the input latch once per state time, regardless whether the port is configured for input or output. The threshold is selected with PICON and XPICON registers control bits. A write operation to a port pin configured as an input causes the value to be written into the port output latch, while a read operation returns the latched state of the pin itself. A read- modify-write operation reads the value of the pin, modifies it, and writes it back to the output latch. Writing to a pin configured as an output (DPx.y=‘1’) causes the output latch and the pin to have the written value, since the output buffer is enabled. Reading this pin returns the value of the output latch. A read-modify-write operation reads the value of the output latch, modifies it, and writes it back to the output latch, thus also modifying the level at the pin. I/O lines support an alternate function which is detailed in the following description of each port. |
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