NEC 78014Y Series User Manual page 242

(2) Port mode register 3 (PM3)
This register sets port 3 input/output in bit-wise.
When using the P35/PCL pin for clock output function, set PM35 and output latch of P35 to 0.
PM3 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM3 to FFH.
Symbol 7
PM3 PM37 PM36
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242
CHAPTER 12 CLOCK OUTPUT CONTROL CIRCUIT
Figure 12-4. Port Mode Register 3 Format
6 5 4 3
PM35 PM34 PM33 PM32
2 1 0 Address
PM31 PM30 FF23H
PM3n
0
1
When Reset R/W
00H R/W
P3n Pin Input/Output Mode Selection
(n = 0 to 7)
Output mode (output buffer ON)
Input mode (output buffer OFF)