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3826OTP Datasheet(PDF) 74 Page - Renesas Technology Corp |
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3826OTP Datasheet(HTML) 74 Page - Renesas Technology Corp |
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74 / 91 page  Rev.1.00 Sep 06, 2006 page 74 of 88 REJ03B0181-0100 3826 Group (One Time PROM version) 3.3.3 Termination of unused pins (1) Terminate unused pins Perform the following wiring at the shortest possible distance (20 mm or less) from microcomputer pins. ➀Output ports Open them. ➁Input ports Connect each pin to VCC or VSS through each resistor of 1 kΩ to 10 kΩ. A for pins whose potential affects to operation modes such as the INTi pin or others, select the VCC pin or the VSS pin according to their operation mode. ➂ I/O ports Set the I/O ports for the input mode and connect each pin to VCC or VSS through each resistor of 1 kΩ to 10 kΩ. The port which can select a built-in pull-up resistor can also use the built- in pull-up resistor. When using the I/O ports as the output mode, open them at “L” or “H”. • When opening them in the output mode, the input mode of the initial status remains until the mode of the ports is switched over to the output mode by the program after reset. Thus, the potential at these pins is undefined and the power source current may increase in the input mode. With regard to an effects on the system, thoroughly perform system evaluation on the user side. • Since the direction register setup may be changed because of a program runaway or noise, set direction registers by program periodically to increase the reliability of program. (2) Termination remarks ■ Input ports Do not open them. ● Reason • The power source current may increase depending on the first-stage circuit. • An effect due to noise may be easily produced as compared with proper termination ➁ shown on the above. ■ I/0 ports setting as input mode [1] Do not open in the input mode. ● Reason • The power source current may increase depending on the first-stage circuit. • An effect due to noise may be easily produced as compared with proper termination ➂ shown on the above. [2] I/O ports : Do not connect to VCC or VSS directly. ● Reason If the direction register setup changes for the output mode because of a program runaway or noise, a short circuit may occur. [3] I/O ports : Do not connect multiple ports in a lump to VCC or VSS through a resistor. ● Reason If the direction register setup changes for the output mode because of a program runaway or noise, a short circuit may occur between ports. |
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