P80C251TB24 datasheet(6/36 Pages) INTEL

Part #	P80C251TB24

Description	TQHIGH-PERFORMANCE CHMOS MICROCONTROLLER

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Manufacturer	INTEL [Intel Corporation]

Direct Link	http://www.intel.com

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2

FIGURES

Figure 1.

8xC251TB/TQ Block Diagram 1

Figure 2.

The 8xC251TB/TQ Family Nomenclature 2

Figure 3.

8xC251TB/TQ 44-pin PLCC Package 4

Figure 4.

8xC251TB/TQ 40-pin PDIP Packages 5

Figure 5.

External Bus Cycle: Code Fetch (Nonpage Mode) 18

Figure 6.

External Bus Cycle: Data Read (Nonpage Mode) 19

Figure 7.

External Bus Cycle: Data Write (Nonpage Mode) 20

Figure 8.

External Bus Cycle: Code Fetch (Page Mode) 21

Figure 9.

External Bus Cycle: Data Read (Page Mode) 22

Figure 10.

External Bus Cycle: Data Write (Page Mode) 23

Figure 11.

External Bus Cycle: Code Fetch/Data Read (Nonpage Mode) 24

Figure 12.

External Bus Cycle: Data Write (Nonpage Mode) 25

Figure 13.

External Bus Cycle: Code Fetch/Data Read (Page Mode) 26

Figure 14.

External Bus Cycle: Data Write (Page Mode) 27

Figure 15.

Serial Port Waveform — Shift Register Mode 28

Figure 16.

External Clock Drive Waveforms 29

Figure 17.

AC Testing Input, Output Waveforms 29

Figure 18.

Float Waveforms 30

TABLES

Table 1.

Description of Product Nomenclature 2

Table 2.

Proliferation Options 3

Table 3.

Package Information 3

Table 4.

8xC251TB/TQ Pin Assignment 6

Table 5.

8xC251TB/TQ PLCC/DIP Pin Assignments Arranged by Functional Category 7

Table 6.

Signal Descriptions 8

Table 7.

Memory Signal Selections (RD1:0) 10

Table 8.

8xC251TB/TQ Address Map 11

Table 9.

DC Characteristics at VCC = 4.5 – 5.5 V 12

Table 10.

AC Timing Symbol Definitions 14

Table 11.

AC Characteristics 14

Table 12.

Real-time Wait Timing Symbol Definitions 24

Table 13.

Real-Time Wait AC Timing 27

Table 14.

Serial Port Timing — Shift Register Mode 28

Table 15.

External Clock Drive 29

Table 16.

Thermal Characteristics 30

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P80C251TB24 Datasheet(PDF) 6 Page - Intel Corporation

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