M24LR64-RDW6T2 STMICROELECTRONICS [STMicroelectronics], M24LR64-RDW6T2 Datasheet - Page 42

• Manufacturer Part Number: M24LR64-RDW6T2
• Description: 64 Kbit EEPROM with password protection & dual interface
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Data rate and data coding
9
9.1
Figure 16. 1 out of 256 coding mode
42/128
Pulse
Modulated
Carrier
Data rate and data coding
The data coding implemented in the M24LR64-R uses pulse position modulation. Both data
coding modes that are described in the ISO15693 are supported by the M24LR64-R. The
selection is made by the VCD and indicated to the M24LR64-R within the start of frame
(SOF).
Data coding mode: 1 out of 256
The value of one single byte is represented by the position of one pause. The position of the
pause on 1 of 256 successive time periods of 18.88 µs (256/f
byte. In this case the transmission of one byte takes 4.833 ms and the resulting data rate is
1.65 Kbits/s (f
Figure 16
decimal) is sent by the VCD to the M24LR64-R.
The pause occurs during the second half of the position of the time period that determines
the value, as shown in
A pause during the first period transmits the data value 00h. A pause during the last period
transmit the data value FFh (255 decimal).
0 1
illustrates this pulse position modulation technique. In this figure, data E1h (225
2
3
C
. . . . . . . . .
. . . . . . . . .
/8192).
. . . . . . . .
Figure
Doc ID 15170 Rev 10
17.
2
2
5
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
4.833 ms
18.88 µs
9.44 µs
C
), determines the value of the
2
5
2
2
5
3
M24LR64-R
AI06656
2
5
4
2
5
5