Q67120-C725 查看數據表（PDF） - Siemens AG

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Q67120-C725

High-Performance 8-Bit CMOS Single-Chip Microcontroller

Siemens AG 

SAB 80C517/80C537

Pin Definitions and Functions (cont’d)

Symbol

Pin Number

I/O *) Function

P-LCC-84 P-MQFP-100-2

XTAL2

39

12

XTAL1

40

13

P2.0 - P2.7 41 - 48

14 - 21

* I = Input

O = Output

– XTAL2

Input to the inverting oscillator amplifier

and input to the internal clock generator

circuits.

– XTAL1

Output of the inverting oscillator

amplifier. To drive the device from an

external clock source, XTAL2 should

be driven, while XTAL1 is left

unconnected. There are no

requirements on the duty cycle of the

external clock signal, since the input to

the internal clocking circuitry is devided

down by a divide-by-two flip-flop.

Minimum and maximum high and low

times as well as rise/fall times specified

in the AC characteristics must be

observed.

I/O Port 2

is a bidirectional I/O port with internal

pull-up resistors. Port 2 pins that have

1 s written to them are pulled high by

the internal pull-up resistors, and in that

state can be used as in-puts. As inputs,

port 2 pins being externally pulled low

will source current (IIL, in the DC

characteristics) because of the internal

pull-up resistors. 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 pull-up resistors 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.

Semiconductor Group

10

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