ST10F280_12 Datasheet, PDF (120/239 Pages) STMicroelectronics – 16-bit MCU with MAC unit, 512 Kbyte Flash memory and 18 Kbyte RAM

Parallel ports
Figure 41. Block diagram of P4.6 and P4.7 pins
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Port 5
This 16-bit input port can only read data. There is no output latch and no direction register.
Data written to P5 will be lost.
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Doc ID 8673 Rev. 3