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3820 Datasheet(PDF) 91 Page - Renesas Technology Corp

Part # 3820
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  349 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

3820 Datasheet(HTML) 91 Page - Renesas Technology Corp

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APPLICATION
2.1 I/O pins
3820 GROUP USER’S MANUAL
2–4
Fig. 2.1.3 Structure of ports P0 and P1 direction registers
Port
Port direction register address
000116
000316
000516
000916
000B16
000D16
000F16
P7
Table 2.1.2 Memory allocation of port direction registers
P0
P1
P2
P4
P5
P6
b7 b6 b5 b4 b3 b2 b1 b0
Port P0 direction register (P0D) [Address 0116]
Port P1 direction register (P1D) [Address 0316]
B
Name
Functions
At reset R W
Port P0 direction register, port P1 direction register
0
1
to
7
Port P0 direction
register /
Port P1 direction
register
0 : All bits are input mode
1 : All bits are output mode
Note: In ports P0 and P1, input/output switching is performed by a port unit.
By setting bit 0 of the corresponding port direction register to “0”, the
port is set for the input mode. By setting to “1”, the port is set for the
output mode. Nothing is allocated for bits 1 to 7 of the ports P0 and
P1 direction registers, and these bits cannot be written to.
Nothing is allocated. These bits cannot be written
to and be read out.
0
×
0
××



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