SAF-C501G-L24P datasheet(10/48 Pages) SIEMENS

Part #	SAF-C501G-L24P

Description	8-Bit CMOS Microcontroller

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Manufacturer	SIEMENS [Siemens Semiconductor Group]

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10 / 48 page

C501

Semiconductor Group

10

1997-04-01

XTAL2

20

18

14

–

XTAL2

Output of the inverting oscillator

amplifier.

XTAL1

21

19

15

–

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. There

are no requirements on the duty cycle of

the external clock signal, since the input

to the internal clocking circuitry is divided

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.

P2.0 – P2.7 24–31

21–28

18–25

I/O

Port 2

is a quasi-bidirectional I/O port with

internal pull-up resistors. Port 2 pins that

have 1s written to them are pulled high

by the internal pull-up resistors, and in

that state they can be used as inputs. As

inputs, port 2 pins being externally pulled

low will source current (

I

IL, 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 1s. During

accesses to external data memory that

use 8-bit addresses (MOVX @Ri), port

2 issues the contents of the P2 special

function register.

*) I

= Input

O = Output

Table 1

Pin Deﬁnitions and Functions (cont’d)

Symbol

Pin Number

I/O*) Function

P-LCC-44 P-DIP-40 P-MQFP-44

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SAF-C501G-L24P Datasheet(PDF) 10 Page - Siemens Semiconductor Group

SAF-C501G-L24P Datasheet(HTML) 10 Page - Siemens Semiconductor Group

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