CHAPTER 4 PORT FUNCTIONS
User's Manual U11919EJ3V0UM00
72
4.2.2 Port 1
This is an 8-bit I/O port with output latch. Port 1 can be specified in the input or output mode in 1-bit units by
using the port mode register 1 (PM1). When using P10 to P17 pins as input port pins, on-chip pull-up resistors can
be connected in 8-bit units by using the pull-up resistor option register (PUO).
RESET input sets port 1 to input mode.
Figure 4-3 shows the block diagram of port 1.
Figure 4-3. Block Diagram of P10 to P17
Internal Bus
WR
PUO
RD
WR
PORT
WR
PM
Output Latch
(P10 to P17)
PM10 to PM17
Selector
PUO1
V
DD0
P-ch
P10 to P17
PUO : Pull-up resistor option register
PM
: Port mode register
RD
: Port 1 read signal
WR : Port 1 write signal
Содержание mPD789026 Subseries
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