P89C51RD2 - 8 bit Microcontroller with 64k Bytes Flash Memory Technical Data

Photograph

Features
80C51 CPU On-chip Flash Program Memory with In-System Programming Boot ROM contains Flash programming routines for downloading via UART 6/12 clocks per machine cycle Speed 20MHz/33MHz with 12 clocks per machine cycle Fully Static Operation RAM expandable externally to 64 kbytes Four Interrupt Priority Levels Seven Interrupt Sources Four 8-bit I/O ports Full-duplex enhanced UART Power Control Modes Programmable Clock Out Asynchronous Port Reset Programmable Counter Array

Features

Pin Layout

Pin Description

Pin Number	Description
1	Port 1.0 / Timer 2
2	Port 1.1 / Timer 2
3	Port 1.2 / External Clock Input
4	Port 1.3 / PCA Module 0
5	Port 1.4 / PCA Module 1
6	Port 1.5 / PCA Module 2
7	Port 1.6 / PCA Module 3
8	Port 1.7 / PCA Module 4
9	Reset
10	Port 3.0 / Serial Input Port
11	Port 3.1 / Serial Outpur Port
12	Port 3.2 / External Interrupt
13	Port 3.3 / External Interrupt
14	Port 3.4 / Timer 0 External Input
15	Port 3.5 / Timer 1 External Input
16	Port 3.6 / External Data Memory Write
17	Port 3.7 / External Data Memory Read
18	Crystal 2
19	Crystal 1
20	Ground
21	Port 2.0
22	Port 2.1
23	Port 2.2
24	Port 2.3
25	Port 2.4
26	Port 2.5
27	Port 2.6
28	Port 2.7
29	Program Strobe Enable
30	Address Latch Enable
31	External Access Enable/Programming Supply
32	Port 0.7
33	Port 0.6
34	Port 0.5
35	Port 0.4
36	Port 0.3
37	Port 0.2
38	Port 0.1
39	Port 0.0
40	Vcc - Power Supply

Dimensional Drawing

Technical Data

Datasheet

Datasheet for P89C51RD2

Application Notes