T48C862-R3 datasheet(90/107 Pages) ATMEL

90 / 107 page

T48C862-R3

4554A–4BMCU–02/03

Figure 90. FSK Modulation

Data EEPROM

The internal data EEPROM offers 2 pages of 512 bits each. Both pages are organized

as 32

´ 16-bit words. The programming voltage as well as the write cycle timing is gen-

erated on chip. To be compatible with the ROM parts, two restrictions have to be taken

into account:

•

To use the same EEPROM page as with the ROM parts the application software has

to write the MCL-command “09h” to the EEPROM. This command has no effect for

the microcontroller if it is left inside the HEX-file for the ROM version.

•

Data handling for read and write is performed using the serial interface MCL.

The page select is performed by either writing “01h” (page 1) or “09h” (page 0) to the

EEPROM.

Figure 91. Data EEPROM

012340 1 23401 2 3

Counter 3

CM31

CM32

40 1 2 0 1 2012 0 120 1 201201 20 1 2 3

T3R

T3O

16-bit read/write buffer

Address

control

8-bit data register

EEPROM

2 x 32 x 16

HV-generator

Timing control

Mode

control

I/O

control

SCL

SDA

Page 1

Page 0

--> Write "01h"

--> Write "09h"

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