C167CS datasheet(185/517 Pages) INFINEON

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C167CS

Derivatives

Dedicated Pins

User’s Manual

8-1

V2.0, 2000-07

Dedicated Pins

Most of the input/output or control signals of the functional the C167CS are realized as

alternate functions of pins of the parallel ports. There is, however, a number of signals

that use separate pins, including the oscillator, special control signals and, of course, the

power supply.

Table 8-1 summarizes the 33 dedicated pins of the C167CS.

The Address Latch Enable signal ALE controls external address latches that provide

a stable address in multiplexed bus modes.

ALE is activated for every external bus cycle independent of the selected bus mode,

i.e. it is also activated for bus cycles with a demultiplexed address bus. When an external

bus is enabled (one or more of the BUSACT bits set) also X-Peripheral accesses will

generate an active ALE signal.

ALE is not activated for internal accesses, i.e. accesses to ROM/OTP/Flash (if provided),

the internal RAM and the special function registers. In single chip mode, i.e. when no

external bus is enabled (no BUSACT bit set), ALE will also remain inactive for

X-Peripheral accesses.

During reset an internal pulldown ensures an inactive (low) level on the ALE output.

Table 8-1

C167CS Dedicated Pins

Pin(s)

Function

ALE

Address Latch Enable

External Read Strobe

WR/WRL

External Write/Write Low Strobe

READY

Ready Input

External Access Enable

NMI

Non-Maskable Interrupt Input

XTAL1, XTAL2

Oscillator Input/Output

RSTIN

Reset Input

RSTOUT

Reset Output

VAREF, VAGND

Power Supply for Analog/Digital Converter

VDD

Digital Power Supply (10 pins)

VSS

Digital Reference Ground (10 pins)

Not connected pin. Should not be connected to the PCB.

C167CS Datasheet(PDF) 185 Page - Infineon Technologies AG

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