SRIX4K datasheet(16/47 Pages) STMICROELECTRONICS

номер детали	SRIX4K

подробное описание детали	13.56 MHz short-range contactless memory chip with 4096-bit EEPROM, anticollision and anti-clone functions

PDF	47 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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Memory mapping

SRIX4K

16/47

Figure 15.

Write_block update in Reload mode (binary format)

4.2

32-bit binary counters

The two 32-bit binary counters located at block addresses 5 and 6, respectively, are used to

count down from 232 (4096 million) to 0. The SRIX4K uses dedicated logic that only allows

the update of a counter if the new value is lower than the previous one. This feature allows

the application to count down by steps of 1 or more. The initial value in Counter 5 is

FFFF FFFEh and is FFFF FFFFh in Counter 6. When the value displayed is 0000 0000h,

the counter is empty and cannot be reloaded. The counter is updated by issuing the

Write_block command to block address 5 or 6, depending on which counter is to be

updated. The Write_block command writes the new 32-bit value to the counter block

address. Figure 17 shows examples of how the counters operate.

The counter programming cycles are protected by automated antitearing logic. This function

allows the counter value to be protected in case of power down within the programming

cycle. In case of power down, the counter value is not updated and the previous value

continues to be stored.

Figure 16.

Binary counter (addresses 5 to 6)

ai07659

...11

1011

...11

1011

...

1011

Previous data stored in block

Data to be written

New data stored in block

b31

Block

Address

MSb

b31

32-bit block

b16 b15

b24 b23

b8 b7

LSb

Description

Count down

Counter

32-bit binary counter

ai07660b

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