H8SSLASH2225 datasheet(404/1071 Pages) RENESAS

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Section 10 I/O Ports

Rev. 5.00 Aug 08, 2006 page 318 of 982

REJ09B0054-0500

Output

(a) Open drain output type for

P34, P35, SCK1, SCL0, and SDA0 pins

NMOS Off

Output

(b) Open drain output type for

P33 to P30, SCL1, and SDA1 pins

PMOS Off

Input

Figure 10.1 Types of Open Drain Outputs

The P34, P35, and SCK1 NMOS push-pull outputs will not output the Vcc level, regardless of the

load, even if set to the high output state. External pull-up resistors are required to output the Vcc

level.

Notes: 1. Note that the signal rise and fall times become longer when external pull-up resistors

are connected. If signals with long rise and fall times are input, use input circuits with

noise absorbing functions, such as Schmitt trigger circuits.

2. Implement external circuit countermeasures such as inserting level shifters if the device

is operated at high speeds.

3. See the output high-level voltage items in tables 27.2, 27.14, 27.27, and 27.39 on pages

34 to 35 for the output characteristics. Use values for the pull-up resistors such that the

allowable output current conditions in tables 27.3, 27.15, 27.28, and 27.40 are met.

* This is not present in the H8S/2227 Group and the H8S/2237 Group products.

The H8S/2227 Group and the H8S/2237 Group products do not have an IIC bus, and

the P34 and P35 pin outputs are CMOS outputs (when the P34ODR and P35ODR bits

for the pins are 0).

When using an emulator that includes either an H8S/2633 evaluation chip or an

H8S/2238 evaluation chip, these pins will be NMOS push-pull outputs. Therefore the

pin output characteristics will differ from those in the H8S/2227 Group and the

H8S/2237 Group products. If CMOS output characteristics are required in pins P34 and

P35, pull up the emulator P34 and P35 pins with an appropriate resistor.

• P36

The pin functions are switched as shown below according to the P36DDR bit condition.

P36DDR

Pin functions

P36 input pin

P36 output pin*

Note:

* When P36ODR is set to 1, functions as NMOS open drain output.

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