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Renesas Singapore - Knowledgebase

Can the same function be allocated to multiple pins using SH-2?

Latest Updated:03/23/2009


In SH-2, can the same function be allocated to multiple pins since same function is available on multiple pins?


When the same function is available on multiple pins, it is possible to allocate the same function to multiple pins. However, there are some cautions shown below.

- When the pin function is input, signals input from several pins are formed as one signal through OR or AND logic and the signal is transmitted into the LSI. When using the functions allocated to multiple pins with two or more pins, use it with care of signal polarity considering the transmit forms.

- When the port input is switched from a low level to the DREQ or the IRQ edge for the pins that are multiplexed with input/output and DREQ or IRQ, the corresponding edge is detected.

- Do not set functions other than those specified in "PEF selected function possibilities" described in "pin functions in each mode" on the chapter of pin function controller on the hardware manuals for each product.

For the other cautions, please refer to "Usage Notes" of the chapter "Pin function controller" on the hardware manual for each product.

*Please check to see the notes related to your product because it is different according to products.

Suitable Products
SH7124, SH7125
SH7146, SH7149
SH7144, SH7145
SH7083, SH7084, SH7085, SH7086