NEC mPD178054 Series User Manual page 73

Figure 4-6. Block Diagram of P33 and P34
Alternate function
RD
WR
PORT
Output latch
(P33, P34)
WR
PM
PM33, PM34
PM: Port mode register
RD: Port 3 read signal
WR: Port 3 write signal
Figure 4-7. Block Diagram of P36 and P37
RD
WR
PORT
Output latch
(P36, P37)
WR
PM
PM36, PM37
Alternate function
PM: Port mode register
RD: Port 3 read signal
WR: Port 3 write signal
CHAPTER 4 PORT FUNCTIONS
Selector
User's Manual U15104EJ2V0UD
P33/TI50
P34/TI51
P36/BEEP0
P37/BUZ
73