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CHAPTER 5 PORT FUNCTIONS
User’s Manual U12697EJ3V0UM
5.2.8 Port 7
This is a 3-bit I/O port with output latch. Input mode/output mode can be specified in 1-bit units with the port 7
mode register. A pull-up resistor can be connected via pull-up resistor option register 7, regardless of whether the
input mode or output mode is specified.
Port 7 supports serial interface data input/output and clock input/output as alternate functions.
RESET input sets port 7 to the input mode.
Figures 5-15 to 5-17 show block diagrams of port 7.
Figure 5-15. Block Diagram of P70
P-ch
WR
PM
WR
PORT
RD
WR
PU
V
DD
Selector
PU70
Output latch
(P70)
PM70
Internal bus
P70/SI2/R
X
D2
Alternate
function
PU:
Pull-up resistor option register
PM:
Port mode register
RD:
Port 7 read signal
WR: Port 7 write signal