SH7261 datasheet(4/1348 Pages) RENESAS

4 / 1348 page

Rev. 2.00 Sep. 07, 2007 Page iv of xxxii

General Precautions on Handling of Product

1. Treatment of NC Pins

Note:

Do not connect anything to the NC pins.

The NC (not connected) pins are either not connected to any of the internal circuitry or are

used as test pins or to reduce noise. If something is connected to the NC pins, the

operation of the LSI is not guaranteed.

2. Treatment of Unused Input Pins

Note:

Fix all unused input pins to high or low level.

Generally, the input pins of CMOS products are high-impedance input pins. If unused pins

are in their open states, intermediate levels are induced by noise in the vicinity, a pass-

through current flows internally, and a malfunction may occur.

3. Processing before Initialization

Note:

When power is first supplied, the product's state is undefined.

The states of internal circuits are undefined until full power is supplied throughout the

chip and a low level is input on the reset pin. During the period where the states are

undefined, the register settings and the output state of each pin are also undefined. Design

your system so that it does not malfunction because of processing while it is in this

undefined state. For those products that have a reset function, reset the LSI immediately

after the power supply has been turned on.

4. Processing when the Power Supply Voltage is beyond the Operating Voltage Specification*

When the power supply voltage exceeds the operating voltage specification, erroneous

operation may occur. To prevent this, design your system so that it does not malfunction. For

example, the system should be reset after the power supply voltage is changed to a value

within the operating voltage specification.

Note: * The voltage must be within the range up to the absolute maximum rating. The LSI may be

permanently damaged if the absolute maximum rating is exceeded.

5. Prohibition of Access to Undefined or Reserved Addresses

Note:

Access to undefined or reserved addresses is prohibited.

The undefined or reserved addresses may be used to expand functions, or test registers

may have been be allocated to these addresses. Do not access these registers; the system's

operation is not guaranteed if they are accessed.

6. Reading from/Writing to Reserved Bit of Each Register

Treat the reserved bit of a register used in each module as follows except in cases where the

specifications for values which are read from or written to the bit are provided in the

description.

The bit is always read as 0. The write value should be 0 or one, which has been read

immediately before writing.

Writing the value, which has been read immediately before writing, has the advantage of

preventing the bit from being affected on its extended function when the function is assigned.

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