P89C51RB2BA datasheet(39/52 Pages) PHILIPS

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Philips Semiconductors

Preliminary specification

89C51RB2/89C51RC2/

89C51RD2

80C51 8-bit Flash microcontroller family

16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM

1999 Sep 23

FLASH EPROM MEMORY

GENERAL DESCRIPTION

The 89C51RB2/RC2/RD2 Flash memory augments EPROM

functionality with in-circuit electrical erasure and programming. The

Flash can be read and written as bytes. The Chip Erase operation will

erase the entire program memory. The Block Erase function can

erase any Flash block. In-system programming and standard parallel

programming are both available. On-chip erase and write timing

generation contribute to a user friendly programming interface.

The 89C51RB2/RC2/RD2 Flash reliably stores memory contents

even after 1000 erase and program cycles. The cell is designed to

optimize the erase and programming mechanisms. In addition, the

combination of advanced tunnel oxide processing and low internal

electric fields for erase and programming operations produces

reliable cycling. The 89C51RB2/RC2/RD2 uses a +5 V VPP supply

to perform the Program/Erase algorithms.

FEATURES

• Flash EPROM internal program memory with Block Erase.

• Internal 1 kB fixed boot ROM, containing low-level in-system

programming routines and a default serial loader. User program

can call these routines to perform In-Application Programming

(IAP). The Boot ROM can be turned off to provide access to the

full 64 kB Flash 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 for a user provided loader.

• Up to 64 kB external program memory if the internal program

memory is disabled (EA = 0).

• Programming and erase voltage +5 V or +12 V.

• Read/Programming/Erase:

– Byte-wise read (100 ns access time).

– Byte Programming (20

ms).

– Typical erase times:

Block Erase (8 kB or 16 kB) in 3 seconds.

Full Erase (64 kB) in 3 seconds.

• Parallel programming with 87C51 compatible hardware interface

to programmer.

• In-system programming.

• Programmable security for the code in the Flash.

• 1000 minimum erase/program cycles for each byte.

• 10-year minimum data retention.

CAPABILITIES OF THE PHILIPS 89C51

FLASH-BASED MICROCONTROLLERS

Flash organization

The 89C51RB2/RC2/RD2 contains 16KB/32KB/64Kbytes of Flash

program memory. This memory is organized as 5 separate blocks.

The first two blocks are 8 kB in size, filling the program memory

space from address 0 through 3FFF hex. The final three blocks are

16 kB in size and occupy addresses from 4000 through FFFF hex.

Figure 43 depicts the Flash memory configurations.

Flash Programming and Erasure

There are three methods of erasing or programming of the Flash

memory that may be used. First, 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. The end-user

application, though, must be executing code from a different block

than the block that is being erased or programmed. Second, the

on-chip ISP boot loader may be invoked. This ISP boot loader will, in

turn, call low-level routines through the same common entry point in

the Boot ROM that can be used by the end-user application. Third,

the Flash may be programmed or erased using the parallel method

by using a commercially available 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 programmer will need to have support for these devices.

Boot ROM

When the microcontroller programs its own Flash memory, all of the

low level details are handled by code that is permanently contained

in a 1 kB Boot ROM that is separate from the Flash memory. A user

program simply calls the common entry point with appropriate

parameters in the Boot ROM to accomplish the desired operation.

Boot ROM operations include things like: erase block, program byte,

verify byte, program security lock bit, etc. The Boot ROM overlays

the program memory space at the top of the address space from

FC00 to FFFF hex, when it is enabled. The Boot ROM may be

turned off so that the upper 1 kB of Flash program memory are

accessible for execution.

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