T89C51RD2-3CWC-L datasheet(61/86 Pages) ATMEL

61 / 86 page

Rev. F - 15 February, 2001

T89C51RD2

8.8. In-Application Programming Method

Several Application Program Interface (API) calls are available for use by an application program to permit selective

erasing and programming of FLASH pages. All calls are made through a common interface, PGM_MTP. The

programming functions are selected by setting up the microcontroller’s registers before making a call to PGM_MTP

at FFF0h. Results are returned in the registers. The API calls are shown in Table 33.

A set of Philips compatible API calls is provided.

When several bytes have to be programmed, it is highly recommanded to use the ATMEL Wireless and

Microcontrollers API “PROGRAM DATA PAGE” call. Indeed, this API call writes up to 128 bytes in a single

command.

Miscellaneous Read Functions

General Format of Function 05

:02xxxx05ffsscc

Where:

02 = number of bytes (hex) in record

xxxx = required field, but value is a “don’t care”

05= “Miscellaneous Read” function code

ffss = subfunction and selection code

0000 = read copy of the signature byte – manufacturer id (58H)

0001 = read copy of the signature byte – device ID# 1 (Family code)

0002 = read copy of the signature byte – device ID # 2 (Memories size and type)

0003 = read copy of the signature byte – device ID # 3 (Product name and revision)

0700 = read the software security bits

0701 = read status byte (BSB)

0702 = read Boot Vector (SBV)

0703 = read copy of the HSB

0800 = read bootloader version

cc = checksum

Example:

:020000050001F0 read copy of the signature byte – device id # 1

Table 33. API calls

API call

Parameter

PROGRAM DATA BYTE

Input Parameters:

R0 = osc freq (integer Not required, left for Philips compatibility)

R1 = 02h

DPTR = address of byte to program

ACC = byte to program

Return Parameter

ACC = 00 if pass, !00 if fail

Table 32. Intel-Hex Records Used by In-System Programming

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