H8SSLASH2218 datasheet(319/750 Pages) RENESAS

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Section 8 I/O Ports

Rev.6.00 Jun. 03, 2008 Page 271 of 698

REJ09B0074-0600

Pin Functions of H8S/2212 Group

Port G pins also function as external interrupt input (

IRQ7) pins and H-UDI (TDI) pins. The

correspondence between the register specification and the pin functions is shown below.

Table 8.96

PG1 Pin Function

PG1DDR

PG1 input pin

PG1 output pin

Pin Function

IRQ7 input pin*

Note: * When this pin is used as an external interrupt input pin, this pin must not be used as an I/O

pin for another function.

Table 8.97

PG0 Pin Function

EMLE

PG0DDR

⎯

Pin Function

PG0 input pin

PG0 output pin

TDI input pin

8.13

Handling of Unused Pins

Unused input pins should be fixed high or low. Generally, the input pins of CMOS products are

high-impedance. Leaving unused pins open can cause the generation of intermediate levels due to

peripheral noise induction. This can result in shoot-through current inside the device and cause it

to malfunction. Table 8.98 lists examples of ways to handle unused pins. For the handling of

dedicated boundary scan pins that are unused, see section 13.2, Pin Configuration, and section

13.5, Usage Notes. Pins marked NC should be left open. For the handling of dedicated USB pins

that are unused, see section 14.8.14, Pin Processing when USB Not Used.

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