Intel Embedded Microcontroller, 8XC251SA, 8XC251SP, 8XC251SQ Minimum Hardware Setup, Minimum Setup

CHAPTER 11

MINIMUM HARDWARE SETUP

This chapter discusses the basic operating requirements of the MCS® 251 microcontroller and de- scribes a minimum hardware setup. Topics covered include power, ground, clock source, and de- vice reset. For parameter values, refer to the device data sheet.

11.1 MINIMUM HARDWARE SETUP

Figure 11-1 shows a minimum hardware setup that employs the on-chip oscillator for the system clock and provides power-on reset. Control signals and Ports 0, 1, 2, and 3 are not shown. See sections 11.3, “Clock Sources” and 11.4.4, “Power-on Reset.”

C1

C2

8XC251Sx

VCC

VCC2

XTAL1RST

XTAL2

VSS

VSS1

VSS2

VCC

+

1µF

Note:

VCC2 is a secondary power pin that reduces power supply noise. VSS1 and VSS2 are secondary ground pins that reduce ground bounce and improve power supply by-passing. Connections to these pins are not required for proper device operation.

A4141-02

Figure 11-1. Minimum Setup

11-1