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ST92163 - 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 I/O Ports Chapter to the section titled “Input/

Output Bit Configuration”.

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.

Pure Open-drain Output

The user can increase the voltage on an I/O pin

over VDD+0.3 Volt where the P-channel MOS tran-

sistor is physically absent: this is allowed on all

“Pure Open Drain” pins. Of course, in this case the

push-pull option is not available and any weak

pull-up must implemented externally.

Table 3. I/O Port Characteristics

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

Input

Outp ut

Weak Pull-Up

Reset State

Port 0[7:0]

TTL/CMOS

Push-Pull/OD

Yes

Bidirectional WPU

Port 1[7:0]

TTL/CMOS

Push-Pull/OD

Yes

Bidirectional WPU

Port 3[7:0]

Schmitt trigger

Push-Pull/OD

Yes

Bidirectional WPU

Port 4[3:0]

Schmitt trigger

Push-Pull/OD

Yes

Bidirectional WPU

Port 5[7:0]

Schmitt trigger

Push-Pull/OD

Yes

Bidirectional WPU

Port 6[1:0]

Port 6[5:2]

Port 6.6

Port 6.7

Schmitt trigger

TTL/CMOS

Schmitt trigger

TTL/CMOS

Pure Open Drain with high sink capability

Push-Pull/OD with high sink capability

Yes

Bidirectional

Bidirectional WPU

Bidirectional

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