ATMEL T89C51RB2, T89C51RC2 User Manual

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T89C51RB2/RC2

8-bit Microcontroller with 16 Kbytes/ 32 Kbytes FLASH

1. Description

T89C51RB2/RC2 is a high performance FLASH version of the 80C51 8-bit microcontrollers. It contains a 16K or 32Kbytes Flash memory block for program and data.

The 16 Kbytes or 32 Kbytes FLASH memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard V

The T89C51RB2/RC2 retains all features of the 80C52 with 256 bytes of internal RAM, a 7-source 4-level interrupt controller and three timer/counters.

In addition, the T89C51RB2/RC2 has a Programmable Counter Array, an XRAM of 1024 byte, a Hardware Watchdog Timer, a Keyboard Interface, a SPI Interface, a more versatile serial channel that facilitates multiprocessor communication (EUART) and a speed improvement mechanism (X2 mode).

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2. Features

• 80C52 Compatible

• 8051 pin and instruction compatible

• Four 8-bit I/O ports

• Three 16-bit timer/counters

• 256 bytes scratch pad RAM

• 10 Interrupt sources with 4 priority levels

• Dual Data Pointer

• Variable length MOVX for slow RAM/peripherals

• ISP (In System Programming) using standard V

power supply.

• Boot ROM contains low level FLASH programming

routines and a default serial loader

• High-Speed Architecture

• 40 MHz in standard mode

• 20 MHz in X2 mode (6 clocks/machine cycle)

• 16K/32K bytes on-chip FLASH program / data

Memory

• Byte and page (128 bytes) erase and write

• 100k write cycles

Pinout is the standard 40/44 pins of the C52.

The fully static design of the T89C51RB2/RC2 allows to reduce system power consumption by bringing the clock frequency down to any value, even DC, without loss of data.

The T89C51RB2/RC2 has 2 software-selectable modes of reduced activity and 8 bit clock prescaler for further reduction in power consumption. In the Idle mode the CPU is frozen while the peripherals and the interrupt system are still operating. In the power-down mode the RAM is saved and all other functions are inoperative.

The added features of the T89C51RB2/RC2 make it more powerful for applications that need pulse width modulation, high speed I/O and counting capabilities such as alarms, motor control, corded phones, smart card readers.

• On-chip 1024 bytes expanded RAM (XRAM)

• Software selectable size (0, 256, 512, 768, 1024

bytes)

• 256 bytes selected at reset for TS87C51RB2/RC2 compatibility

• Keyboard interrupt interface on port P1

• SPI Interface (Master / Slave Mode)

• 8-bit clock prescaler

• Improved X2 mode with independant selection for

CPU and each peripheral

• Programmable Counter Array 5 Channels with:

• High Speed Output,

• Compare / Capture,

• Pulse Width Modulator,

• Watchdog Timer Capabilities

• Asynchronous port reset

• Full duplex Enhanced UART

• Dedicated Baud Rate Generator for UART

• Low EMI (inhibit ALE)

Rev. B - 30-Mar-01

Preliminary

T89C51RB2/RC2

• Hardware Watchdog Timer (One-time enabled with Reset-Out)

• Power control modes:

• Idle Mode.

• Power-down mode.

-50µA at 3V

- 100µA Commercial at 5V

- 150µA Industrial at 5V

• Power-Off Flag.

• Power supply: 4.5 to 5.5V or 2.7 to 3.6V

• Temperature ranges: Commercial (0 to +70°C) and industrial (-40°C to +85°C).

• Packages: PDIL40, PLCC44, VQFP44

Table 1. Memory Size

T89C51RB2 16k 1024 1280 32

T89C51RC2 32k 1024 1280 32

3. Block Diagram

XTAL1

XTAL2

ALE/

PROG

PSEN

Flash (bytes) XRAM (bytes)

RxD

TxD

(2)(2)

EUART

BRG

CPU

RAM

256x8

C51

CORE

IB-bus

Flash

32Kx8 or

16Kx8

TOTAL RAM

(bytes)

Vss

1Kx8

Boot ROM 2Kx8

XRAM

(1)

ECI

PCA

(1)

(1) (1)

T2EX

Timer2

I/O

(2)

Timer 0 Timer 1

(2) (2) (2) (2)

RESET

INT Ctrl

INT1

INT0

(1): Alternate function of Port 1 (2): Alternate function of Port 3

Parallel I/O Ports & Ext. Bus

Port 0

Port 1

Port 2

Port 3

Port I2

PI2

Watch

Dog

Key

Board

SPI

(1) (1) (1)

(1)

MISO

MOSI

SCK

Rev. B - 30-Mar-01

Preliminary

T89C51RB2/RC2

4. SFR Mapping

The Special Function Registers (SFRs) of the T89C51RB2/RC2 fall into the following categories:

• C51 core registers: ACC, B, DPH, DPL, PSW, SP

• I/O port registers: P0, P1, P2, P3

• Timer registers: T2CON, T2MOD, TCON, TH0, TH1, TH2, TMOD, TL0, TL1, TL2, RCAP2L, RCAP2H

• Serial I/O port registers: SADDR, SADEN, SBUF, SCON

• PCA ( Programmable Counter Array ) registers : CCON , CCAPMx , CL , CH , CCAPxH , CCAPxL (x : 0 to 4)

• Power and clock control registers: PCON

• Hardware Watchdog Timer registers : WDTRST, WDTPRG

• Interrupt system registers: IE0, IPL0, IPH0 , IE1 , IPL1 , IPH1

• Keyboard Interface registers : KBE , KBF , KBLS

• SPI registers : SPCON , SPSTR , SPDAT

• BRG ( Baud Rate Generator ) registers : BRL , BDRCON

• Flash register : FCON

• Clock Prescaler register : CKRL

• Others: AUXR, AUXR1 , CKCON0 , CKCON1

Rev. B - 30-Mar-01

Preliminary

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