C508 datasheet(12/93 Pages) INFINEON

12 / 93 page

C508

Data Sheet

2000-08

P2.0-

P2.7

47 - 54

55 - 62

I/O

Port 2

is an 8-bit quasi-bidirectional I/O port with

internal pullup transistors. Port 2 pins that have

“1”s written to them are pulled high by the

internal pullup resistors, and in that state can

be used as inputs. As inputs, Port 2 pins being

externally pulled low will source current (

IIL, in

the DC characteristics) because of the internal

pullup transistors.

Port 2 emits the high-order address byte during

fetches from external program memory and

during accesses to external data memory that

use 16-bit addresses (MOVX @DPTR). In this

application it uses strong internal pullup

transistors when issuing “1”s. During accesses

to external data memory that use 8-bit

addresses (MOVX @Ri), Port 2 issues the

contents of the P2 special function register and

uses only the internal pullup transistors.

As I/O functions, Port 2 pins also have LED

drive capability of up to 10 mA sinking current

per pin.

XTAL1 42

XTAL1

Input to the inverting oscillator amplifier and

input to the internal clock generator circuits.

To drive the device from an external clock

source, XTAL1 should be driven, while XTAL2

is left unconnected.

Minimum and maximum high and low times as

well as rise/fall times specified in the AC

characteristics must be observed.

XTAL2 41

XTAL2

Output of the inverting oscillator amplifier.

Table 1

Pin Defintions and Functions (cont’d)

Sym-

bol

Pin Numbers

I/O1) Function

P-MQFP-64 P-SDIP-64

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