Port 1 - NEC mPD780973 Series Preliminary User's Manual

WR
PUO
RD
WR
PORT
WR
PM
PU : Pull-up resistor option register
PM : Port mode register
RD : Port 0 read signal
WR : Port 0 write signal

5.2.2 Port 1

Port 1 is a 5-bit input only port.
Alternate functions include an A/D converter analog input.
Figure 5-3 shows a block diagram of port 1.
RD : Port 1 read signal
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CHAPTER 5 PORT FUNCTIONS
Figure 5-2. P00 to P07 Block Diagram
PU00 to PU07
Selector
Output latch
(P00 to P07)
PM00 to PM07
Figure 5-3. P10 to P14 Block Diagram
RD
V
DD
P-ch
P00/INTP0
P02/INTP2
P03 to P07
P10/ANI0
P14/ANI4