NEC uPD78056Y - Manual (Page 188)

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CHAPTER 8 16-BIT TIMER/EVENT COUNTER
PM37 PM36 PM35 PM34 PM33 PM32 PM31 PM30
7 6 5 4 3 2 1 0 Symbol
PM3 FF23H FFH R/W
Address After Reset R/W
PM3n P3n Pin Input/Output Mode Selection (n = 0 to 7)
0 Output mode (output buffer ON)
1 Input mode (output buffer OFF)
(5) Port mode register 3 (PM3)
This register sets port 3 input/output in 1-bit units.
When using the P30/TO0 pin for timer output, set PM30 and output latch of P30 to 0.
PM3 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM3 value to FFH.
Figure 8-7. Port Mode Register 3 Format