T89C51RD2-3CBC-L ATMEL [ATMEL Corporation], T89C51RD2-3CBC-L Datasheet - Page 47
T89C51RD2-3CBC-L
Manufacturer Part Number
T89C51RD2-3CBC-L
Description
0 to 40MHz Flash Programmable 8-bit Microcontroller
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.T89C51RD2-3CBC-L.pdf
(86 pages)
- Current page: 47 of 86
- Download datasheet (934Kb)
7. EEPROM data memory
7.1. General description
The EEPROM memory block contains 2048 bytes and is organized in 32 pages (or rows) of 64 bytes. The necessary
high programming voltage is generated on-chip using the standard Vcc pin of the microcontroller.
The EEPROM memory block is located at the addresses 0000h to 07FFh of the XRAM memory space and is
selected by setting control bits in the EECON register.
A read in the EEPROM memory is done with a MOVX instruction.
A physical write in the EEPROM memory is done in two steps : write data in the column latches and transfer of
all data latches in a EEPROM memory row (programming).
The number of data written in the page may vary from 1 to 64 (the page size). When programming, only the data
written in the column latch are programmed. This provides the capability to program the whole memory by bytes,
by page or by a number of bytes in a page.
7.2. Write Data in the column latches
Data is written by byte to the column latches as if it was in an external RAM memory. Out of the 16 address bits
of the data pointer, the 10 MSB are used for page selection and 6 are used for byte selection. Between two
EEPROM programming, all addresses in the column latches must remain in the same page, thus the 10MSB must
be unchanged.
The following procedure is used to write in the colums latches :
7.3. Programming
The EEPROM programming consists on the following actions :
Rev. F - 15 February, 2001
Map the program space (Set bit EEE of EECON register)
Load DPTR with the address to write
Load A register with the data to be written
Execute a MOVX @DPTR, A
If needed loop the three last instructions until the end of a 64bytes page
write one or more bytes in a page in the column latches. Normally, all bytes must belong to the same page;
if this is not the case, the first page address is latched and the others are discarded.
Set EETIM with the value corresponding to the XTAL frequency.
Launch the programming by writing the control sequence (52h or 50h followed by A2h or A0h) to the EECON
register (see Table 25).
EEBUSY flag in EECON is then set by hardware to indicate that programming is in progress and that EEPROM
segment is not available for read.
The end of programming is signaled by a hardware clear of the EEBUSY flag.
T89C51RD2
47
Related parts for T89C51RD2-3CBC-L
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
0 to 40 MHz Flash Programmable 8-bit Microcontroller
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
0 To 40 Mhz Flash Programmable 8-bit Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
0 to 40MHz Flash Programmable 8-bit Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory, 16Kbit
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet: