C167CS datasheet(157/517 Pages) INFINEON

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C167CS

Derivatives

Parallel Ports

User’s Manual

7-30

V2.0, 2000-07

Figure 7-14

Port 3 IO and Alternate Functions

The port structure of the Port 3 pins depends on their alternate function (see

Figure 7-15).

When the on-chip peripheral associated with a Port 3 pin is configured to use the

alternate input function, it reads the input latch, which represents the state of the pin, via

the line labeled “Alternate Data Input”. Port 3 pins with alternate input functions are:

T0IN, T2IN, T3IN, T4IN, T3EUD, and CAPIN.

When the on-chip peripheral associated with a Port 3 pin is configured to use the

alternate output function, its “Alternate Data Output” line is ANDed with the port output

latch line. When using these alternate functions, the user must set the direction of the

port line to output (DP3.y = 1) and must set the port output latch (P3.y = 1). Otherwise

the pin is in its high-impedance state (when configured as input) or the pin is stuck at ‘0’

(when the port output latch is cleared). When the alternate output functions are not used,

the “Alternate Data Output” line is in its inactive state, which is a high level (‘1’). Port 3

pins with alternate output functions are:

T6OUT, T3OUT, TxD0, and CLKOUT/FOUT.

When the on-chip peripheral associated with a Port 3 pin is configured to use both the

alternate input and output function, the descriptions above apply to the respective

current operating mode. The direction must be set accordingly. Port 3 pins with alternate

input/output functions are:

MTSR, MRST, RxD0, and SCLK.

Note: Enabling the CLKOUT function automatically enables the P3.15 output driver.

Setting bit DP3.15 = ‘1’ is not required.

The CLKOUT function is automatically enabled in emulation mode.

MCA04426

P3.15

P3.13

P3.12

P3.11

P3.10

P3.9

P3.8

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2

P3.1

P3.0

Port 3

No Pin

Alternate Function

General Purpose

Input/Output

T2IN

T3IN

T4IN

T3EUD

T3OUT

CAPIN

T6OUT

T0IN

CLKOUT

SCLK

BHE

RxD0

TxD0

MTSR

MRST

WRH

FOUT

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