ib technology

10

Card STATUS

Command to return card status.

The acknowledge byte flags indicate general Mifare card status.

B7

B0

Command:

0 1 0 1 0 0 1 1

(Ascii “S”, 0x53)

Acknowledge:

1 F F F F F F X

(F = Status flags)

Program EEPROM

The Micro RWD has some internal EEPROM for storing system parameters such as polling

rate and authorised identity codes (serial numbers). This command sequence allows individual

bytes of the EEPROM to be programmed with new data. The data is internally read back after

programming to verify successful operation. Note that due to the fundamental nature of these

system parameters, incorrect data may render the system temporarily inoperable.

B7

B0

Command:

0 1 0 1 0 0 0 0

(Ascii “P”, 0x50)

Argument1:

N N N N N N N N

(N = EEPROM memory location 0 - 255)

Argument2:

D D D D D D D D

(D = data to write to EEPROM)

Acknowledge:

1 X X X F X X F

(F = Status flags)

Internal EEPROM memory map

Polling delay parameter values (EEPROM location 0):

Parameter 0 value

Polling Delay

SLEEP Period

0x00

0 mS

0x10

8 mS

0x20

16 mS

0x30

32 mS

0x40

65 mS

0x50

132 mS

0x60

262 mS

0x70

524 mS

0x80

1 second

0x90

2 seconds

0xA0

4 seconds

0xB0

8 seconds

Polling delay can be set from 0 to 8 seconds to give complete control over current

consumption and battery life. Note that setting Polling delay = 0x00 skips the SLEEP and

power-down operation so polling is as fast as possible (and current consumption is highest).

(SLEEP and power-down is skipped)