H8SSLASH2225 datasheet(403/1071 Pages) RENESAS

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Section 10 I/O Ports

Rev. 5.00 Aug 08, 2006 page 317 of 982

REJ09B0054-0500

10.2.4

Port 3 Open Drain Control Register (P3ODR)

P3ODR controls on/off state of the PMOS for port 3 pins.

Bit

Bit Name

Initial Value

R/W

Description

—

Undefined

—

Reserved

These bits are always read as undefined value.

P36ODR

R/W

P35ODR

R/W

P34ODR

R/W

P33ODR

R/W

P32ODR

R/W

P31ODR

R/W

P30ODR

R/W

When each of P36ODR and P33ODR to P30ODR

bits is set to 1, the corresponding pins P36 and

P33 to P30 function as NMOS open drain outputs.

When cleared to 0, the corresponding pins

function as CMOS outputs. When each of

P35ODR and P34ODR bits is set to 1, the

corresponding pins P35 and P34 function as open

drain outputs. When they are cleared to 0, the

corresponding pins function as NMOS push pull

outputs.*

Note:

* When they are cleared to 0, the corresponding pins function as CMOS outputs in the

H8S/2237 Group and H8S/2227 Group.

10.2.5

Pin Functions

The port 3 pins also function as SCI I/O input pins, I2C bus interface* I/O pins, and as external

interrupt input pins.

As shown in figure 10.1, when the pins P35, P34, SCK1, SCL0, or SDA0 type open drain output

is used, a bus line is not affected even if the power supply for this LSI fails. Use (a) type open

drain output when using a bus line having a state in which the power is not supplied to this LSI.

Note: * The I2C bus interface is not available in the H8S/2237 Group and H8S/2227 Group.

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