UPD78F1502AGK-GAK-AX Datasheet, PDF (200/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 4 PORT FUNCTIONS
(2) Port registers (Pxx)
These registers write the data that is output from the chip when data is output from a port.
If the data is read in the input mode, the pin level is read. If it is read in the output mode, the output latch value is
read^Note.
These registers can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears these registers to 00H.
Note It is always 0 and never a pin level that is read out if a port is read during the input mode when P2 and P15 are
set to function as an analog input for a A/D converter , and P11 are set to function as an analog input for a D/A
converter.
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Jun 20, 2011