C513AO-2E 데이터 시트보기 (PDF) - Infineon Technologies

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C513AO-2E

8-bit CMOS Microcontroller

Infineon Technologies 

C513AO

Table 1

Pin Definitions and Functions (cont’d)

Symbol Pin Number

P- DIP P-LCC- P-MQFP-

-40 44

44

I/O Function

*)

XTAL2 18

20

14

O XTAL2

Output of the inverting oscillator amplifier.

XTAL1 19

21

15

I 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

21-28 24-31 18-25

I/O Port 2

Port 2 is a an 8-bit quasi-bidirectional I/O port with

internal pull-up arrangement. Port 2 pins that have

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

pull-up transistors, 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 pull-up transistors.

PSEN 29

32

26

O Program Store Enable

This is a control signal that enables output of the

external program memory to the bus during external

fetch operations. It is activated every three oscillator

periods except during external data memory

accesses. It remains high during internal program

execution.

This pin should not be driven during reset operation.

*) I = Input

O = Output

Data Sheet

9

02.00

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