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7721 датащи(PDF) 92 Page - Renesas Technology Corp

номер детали 7721
подробное описание детали  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 датащи(HTML) 92 Page - Renesas Technology Corp

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7721 Group User’s Manual
6–3
INPUT/OUTPUT PINS
6.2.1 Direction register
This register determines the I/O direction of programmable I/O ports. Each bit of this register corresponds
one for one to each pin of the microcomputer.
Figure 6.2.2 shows the structure of port Pi (i = 4 to 10) direction register.
6.2 Programmable I/O ports
Bit
Bit name
Functions
0
1
2
3
4
5
6
7
Port Pi0 direction bit
Port Pi2 direction bit
Port Pi3 direction bit
Port Pi4 direction bit
Port Pi6 direction bit
0 : Input mode
(The port functions as an input port)
1 : Output mode
(The port functions as an output port)
Port Pi5 direction bit
Port Pi direction register (i = 4 to 10)
(Addresses C16, D16, 1016, 1116, 1416, 1516, 1816)
b1
b0
b2
b3
b4
b5
b6
b7
Port Pi1 direction bit
Port Pi7 direction bit
At reset
RW
0
0
0
0
0
0
0
0
RW
RW
RW
RW
RW
RW
RW
RW
Note: For bits 0 to 2 of the port P4 direction register, nothing is assigned and these bits are fixed to “0” at
reading.
Fig. 6.2.2 Structure of port Pi (i = 4 to 10) direction register



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