Kineski IC tester pitanje

Da li vredi nešto ovaj IC tester sa alija:
http://www.aliexpress.com/item...and-40-Series/32259835235.html

Drugo, nije mi jasno kako su uspeli da povežu CMOS IC direktno na mikrokontroler bez pull-up otpornika (ulazi mikrokontrolera zahtevaju pull-up otpornike a i ulazi CMOS kola). Kod 16-pinskih CMOS kola, 14 pinova treba da ima ove otpornike (što kao ulazi CMOS , što kao ulazi MCU) a u mikrokontroleru je moguće aktivirati samo 8.

Mikrokontroleri veoma često (u 99.9% slučajeva imaju interne pullup-ove).

Potpis

--
Make no mistake between my personality and my attitude.
My personality is who I am.
My attitude depends on who you are.

To je tačno, ali samo na jednom portu, što će reći 8 pinova. Šta sa preostalim?

Odakle ti ta glupost da mikrokontroleri imaju pull-up samo na jednom portu?

Ako znas koji mikrokontroler je u pitanju na tom uredjaju, pogledaj njegov datasheet.

Potpis

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ATmega640-1280-1281-2560-2561 (ako se dobro secam na tom ic testeru je atmega1280):

Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit)
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
Port E is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
Port F serves as analog inputs to the A/D Converter. Port F also serves as an 8-bit bi-directional I/O port, if the A/D Converter is not used. Port pins can provide internal pull-up resistors (selected for each bit).
Port G is a 6-bit I/O port with internal pull-up resistors (selected for each bit).
Port H is a 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
Port J is a 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
Port K is a 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit)
Port L is a 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).

Potpis

arhimed
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