T89C51RC2-3CSIM datasheet(94/117 Pages) ATMEL

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T89C51RB2/RC2

4105D–8051–10/06

Flash EEPROM

Memory

The Flash memory increases EPROM and ROM functionality with in-circuit electrical

erasure and programming. It contains 16K or 32K bytes of program memory organized

respectively in 128 or 256 pages of 128 bytes. This memory is both parallel and serial

In-System Programmable (ISP). ISP allows devices to alter their own program memory

in the actual end product under software control. A default serial loader (bootloader) pro-

gram allows ISP of the Flash.

The programming does not require 12V external programming voltage. The necessary

high programming voltage is generated on-chip using the standard VCC pins of the

microcontroller.

Features

•Flash E

2PROM internal program memory.

•

Boot vector allows user provided Flash loader code to reside anywhere in the Flash

memory space. This configuration provides flexibility to the user.

•

Default loader in Boot ROM allows programming via the serial port without the need

of a user provided loader.

•

Up to 64K byte external program memory if the internal program memory is disabled

(EA = 0).

•

Programming and erase voltage with standard 5V or 3V VCC supply.

•

Read/Programming/Erase:

•

Byte-wise read without wait state

•

Byte or page erase and programming (10 ms)

•

Typical programming time (32K bytes) in 10s

•

Parallel programming with 87C51 compatible hardware interface to programmer

•

Programmable security for the code in the Flash

•

10k write cycles

•

10 years data retention

Flash Programming and

Erasure

The 16K or 32K bytes Flash is programmed by bytes or by pages of 128 bytes. It is not

necessary to erase a byte or a page before programming. The programming of a byte or

a page includes a self erase before programming.

There are three methods of programming the Flash memory:

•

First, the on-chip ISP bootloader may be invoked which will use low level routines to

program the pages. The interface used for serial downloading of Flash is the UART.

•

Second, the Flash may be programmed or erased in the end-user application by

calling low-level routines through a common entry point in the Boot ROM.

•

Third, the Flash may be programmed using the parallel method by using a

conventional EPROM programmer. The parallel programming method used by

these devices is similar to that used by EPROM 87C51 but it is not identical and the

commercially available programmers need to have support for the

T89C51RB2/RC2. The bootloader and the Application Programming Interface (API)

routines are located in the BOOT ROM.

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