DS80C320-FNG Просмотр технического описания (PDF) - Maxim Integrated

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DS80C320-FNG

High-Speed/Low-Power Microcontrollers

Maxim Integrated 

Figure 1. Block Diagram

DS80C320/DS80C323 High-Speed/Low-Power Microcontrollers

DS80C320/

DS80C323

PIN DESCRIPTION

PIN

DIP PLCC TQFP

NAME

40

44

38

20 22, 23 16, 17

VCC

GND

9

10

4

RST

18 20

19 21

14 XTAL2

15 XTAL1

29 32

26

PSEN

FUNCTION

+5V (+3V for DS80C323)

Digital Circuit Ground

Reset Input. The RST input pin contains a Schmitt voltage input to

recognize external active-high reset inputs. The pin also employs an

internal pulldown resistor to allow for a combination of wired OR

external reset sources. An RC is not required for power-up, as the device

provides this function internally.

Crystal Oscillator Pins. XTAL1 and XTAL2 provide support for

parallel-resonant, AT-cut crystals. XTAL1 acts also as an input in the

event that an external clock source is used in place of a crystal. XTAL2

serves as the output of the crystal amplifier.

Program Store-Enable Output, Active Low. This signal is commonly

connected to external ROM memory as a chip enable. PSEN provides an

active-low pulse width of 2.25 XTAL1 cycles with a period of four

XTAL1 cycles. PSEN is driven high when data memory (RAM) is being

accessed through the bus and during a reset condition.

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