ST90135 datasheet(13/190 Pages) STMICROELECTRONICS

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ST90158 - GENERAL DESCRIPTION

1.3 I/O PORT PINS

All the ports of the device can be programmed as

Input/Output or in Input mode, compatible with

TTL or CMOS levels (except where Schmitt Trig-

ger is present). Each bit can be programmed indi-

vidually (Refer to the I/O ports chapter).

TTL/CMOS Input

For all those port bits where no input schmitt trig-

ger is implemented, it is always possible to pro-

gram the input level as TTL or CMOS compatible

by programming the relevant PxC2.n control bit.

Refer to the section titled “Input/Output Bit Config-

uration” in the I/O Ports Chapter .

Push-Pull/OD Output

The output buffer can be programmed as push-

pull or open-drain: attention must be paid to the

fact that the open-drain option corresponds only to

a disabling of P-channel MOS transistor of the

buffer itself: it is still present and physically con-

nected to the pin. Consequently it is not possible to

increase the output voltage on the pin over

VDD+0.3 Volt, to avoid direct junction biasing.

Table 1. I/O Port Characteristics

Legend: WPU = Weak Pull-Up, OD = Open Drain

Input

Output

Weak Pull-Up

Reset State

Port 0

TTL/CMOS

Push-Pull/OD

Yes

Bidirectional WPU

Port 1

TTL/CMOS

Push-Pull/OD

Yes

Bidirectional WPU

Port 2

TTL/CMOS

Push-Pull/OD

Bidirectional

Port 4

Schmitt trigger

Push-Pull/OD

Yes

Bidirectional WPU

Port 5

Schmitt trigger

Push-Pull/OD

Yes

Bidirectional WPU

Port 6

TTL/CMOS

Push-Pull/OD

Bidirectional

Port 7

Schmitt trigger

Push-Pull/OD

Yes

Bidirectional WPU

Port 8

Schmitt trigger

Push-Pull/OD

Yes

Bidirectional WPU

Port 9

Schmitt trigger

Push-Pull/OD

Yes

Bidirectional WPU

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