AT89C5131A-RDTIM datasheet(37/186 Pages) ATMEL

37 / 186 page

AT89C5130A/31A-M

4337G–USB–11/06

Flash EEPROM Memory

General Description

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

programming. It contains 16/32 Kbytes of program memory organized in 128/256 pages

of 128 bytes, respectively. This memory is both parallel and serial In-System Program-

mable (ISP). ISP allows devices to alter their own program memory in the actual end

product under software control. A default serial loader (bootloader) program 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 EEPROM 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 EEPROM allows programming via the serial port without the

need of a user provided loader.

•

Up to 64K bytes external program memory if the internal program memory is

disabled (EA = 0).

•

Programming and erase voltage with standard power supply.

•

Read/Program/Erase:

•

Byte-wise read (without wait state).

•

Byte or page erase and programming (10 ms).

•

Typical programming time (32 Kbytes) in 4.5 sec.

•

Parallel programming with 87C51 compatible hardware interface to programmer.

•

Programmable security for the code in the Flash.

•

100K write cycles for code memory

•

1K write cycles for configuration bits (BLJB, X2, OSCON1, OSCON0)

•

10 years data retention

Flash Programming and

Erasure

The 16/32 Kbytes Flash is programmed by bytes or by pages of 128 bytes. It is not nec-

essary 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:

1. 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

USB.

2. 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 Flash.

3. The Flash may be programmed using the parallel method.

The bootloader and the Application Programming Interface (API) routines are located in

the Flash Bootloader.

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