Datasheet

Section 8 I/O Ports
Rev.7.00 Dec. 24, 2008 Page 271 of 698
REJ09B0074-0700
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 0 1
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 0 1
PG0DDR 0 1 ⎯
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.