IBM uPD78081 ユーザーズマニュアル
56
CHAPTER 4 PORT FUNCTIONS
Figure 4-2. P00 Block Diagram
Figure 4-3. P01 to P03 Block Diagram
PUO : Pull-up resistor option register
PM
: Port mode register
RD
: Port 0 read signal
WR : Port 0 write signal
P00
RD
Internal bus
P-ch
WR
PM
WR
PORT
RD
WR
PUO
V
DD
P01/INTP1
P03/INTP3
Selector
PUO0
Output Latch
(P01 to P03)
(P01 to P03)
PM01-PM03
Internal bus