STC89C53RC datasheet(4/165 Pages) STC

4 / 165 page

1.1 Features

Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle

Operation voltage range: 5.5V~3.3V (STC89C series) or 2.0V~ 3.6V (STC89LE series)

Operation frequency range: 0- 48MHz@12T, or 0-24MHz@6T

On-chip 4/8/13/16/20/32/64K FLASH program memory with flexible ISP/IAP capability

On-chip 1280 byte / 512 byte RAM

Be capable of addressing up to 64K byte of external RAM

Be capable of addressing up to 64K bytes external memory

Dual Data Pointer (DPTR) to speed up data movement

Three 16-bit timer/counter, Timer 2 is an up/down counter with programmable clcok output on P1.0

8 vector-address, 4 level priority interrupt capability

One enhanced UART with hardware address-recognition, frame-error detection function, and with self baud-

rate generator.

One 15 bits Watch-Dog-Timer with 8-bit pre-scaler (one-time-enabled)

integrate MAX810 — specialized reset circuit

Three power management modes: idle mode and power-down mode

Low EMI: inhibit ALE emission

Power down mode can be woken-up by INT0/P3.2 pin, INT1/P3.3 pin, T0/P3.4, T1/P3.5, RXD/P3.0 pin,

INT2/P4.3, INT3/P4.2

Maximum 39 programmable I/O ports are available

Four 8-bit bi-directonal ports; extra four-bit additional P4 are available for PLCC-44 and LQFP-44

Operating temperature: -40 ~ +85oC (industrial) / 0~75oC (commercial)

package type :PQFP-44,LQFP-44,PDIP-40,PLCC-44

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Chapter 1 Introduction

STC89xx series, which is produced by STC MCU Limited, is a 8-bit single-chip microcontroller with a fully

compatible instruction set with industrial-standard 80C51 series microcontroller. There is 64K bytes flash

memory embeded for appliaction program, which is shared with In-System-Programming code.In-System-

Programming (ISP) and In-Application-Programming (IAP) support the users to upgrade the program and data

in system. ISP allows the user to download new code without removing the microcontroller from the actual end

product;IAP means that the device can write non-valatile data in Flash memory while the application program

is running. There are 1280 bytes or 512 bytes on-chip RAM embedded that provides requirement from wide

field application. The user can configure the device to run in 12 clocks per machine cycle, and to get the same

performance just as he uses another standard 80C51 device that is provided by other vendor, or 6 clocks per

machine cycle to achieve twice performance. The STC89xx series retain all features of the standard 80C51. In

addition, the STC89xx series have a extra I/O port (P4 ), Timer 2, a 8-sources, 4-priority-level interrupt structure,

on-chip crystal oscillator,and a one-time enabled Watchdog Timer.

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