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H8/3021 Datasheet(PDF) 174 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 174 Page - Renesas Technology Corp

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7. I/O Ports
Rev.2.00 Mar. 22, 2007 Page 150 of 684
REJ09B0352-0200
Port 5
P5 (input/output)
P5 (input/output)
P5 (input/output)
P5 (input/output)
3
2
1
0
Figure 7.15 Pin Functions in Mode 7 (Port 5)
7.5.4
Input Pull-Up Transistors
Port 5 has built-in MOS input pull-up transistors that can be controlled by software. These input
pull-up transistors can be turned on and off individually.
When a P5PCR bit is set to 1 and the corresponding P5DDR bit is cleared to 0, the input pull-up
transistor is turned on.
The input pull-up transistors are turned off by a reset and in hardware standby mode. In software
standby mode they retain their previous state.
Table 7.7 summarizes the states of the input pull-up transistors in each mode.
Table 7.7
Input Pull-Up Transistor States (Port 5)
Mode
Reset
Hardware Standby Mode
Software Standby Mode
Other Modes
1
3
Off
Off
Off
Off
5
6
7
Off
Off
On/off
On/off
Legend
Off:
The input pull-up transistor is always off.
On/off:
The input pull-up transistor is on if P5PCR = 1 and P5DDR = 0. Otherwise, it is off.



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