MCRF200ISLASHP14D datasheet(6/24 Pages) MICROCHIP

6 / 24 page

MCRF200

DS21219H-page 6

 2003 Microchip Technology Inc.

FIGURE 2-3:

PSK DATA MODULATION

2.2.4

MEMORY ARRAY LOCK BIT (CB12)

The CB12 must be ‘0’ for contactless programming

(Blank). The bit (CB12) is automatically set to ‘1’ as

soon as the device is programmed contactlessly.

2.3

Memory Section

The device has 128 bits of one-time programmable

(OTP) memory. The user can choose 96 or 128 bits by

selecting the CB1 bit in the configuration register. See

Table 2-4 for more details.

2.3.1

COLUMN AND ROW DECODER

LOGIC AND BIT COUNTER

The column and row decoders address the EEPROM

array at the clock rate and generate a serial data

stream for modulation. This data stream can be up to

128 bits in length. The size of the data stream is user

programmable with CB1 and can be set to 96 or 128

bits. Data lengths of 48 and 64 bits are available by

programming the data twice in the array, end-to-end.

The column and row decoders route the proper voltage

to the array for programming and reading. In the

programming modes, each individual bit is addressed

serially from bit 1 to bit 128.

2.4

Examples of Configuration

Settings

EXAMPLE 2-1:

“08D” CONFIGURATION

EXAMPLE 2-2:

“00A” CONFIGURATION

EXAMPLE 2-3:

MCRF200

CONFIGURATION FOR

FDX-B ISO ANIMAL

STANDARD PROTOCOL

(ASP)

‘0’

‘1’

Encoded Data

PSK_ 1

Change on Data

PSK _2

Change on ‘1’

(NRZ_L)

‘1’

The “08D” (hex) configuration is interpreted as

follows:

“08D”

→ 0000-1000-1101

Referring to Table 2-4, the “08D” configuration

represents:

Modulation = PSK_1

PSK rate = rf/2

Data encoding = NRZ_L (direct)

Baud rate = rf/32 = MOD32

Memory size 128 bits

CB12

CB1

The “00A” (hex) configuration is interpreted as

follows:

“00A”

→ 0000-0000-1010

The MSB corresponds to CB12 and the LSB

corresponds to CB1 of the configuration register.

Therefore, we have:

Referring to Table 2-4, the “00A” configuration

represents:

Not programmed device (blank), anticollision:

disabled, FSK protocol, NRZ_L (direct) encod-

ing, MOD50 (baud rate = rf/50), 96 bits.

CB12=0

CB11=0

CB10=0

CB9=0

CB8=0

CB7=0

CB6=0

CB5=0

CB4=1

CB3=0

CB2=1

CB1=0

CB12

CB1

The FDX-B ISO Specification is:

Modulation = ASK

Data encoding = Differential biphase

Baud rate = rf/32 = 4 Kbits/sec for 128 kHz

Memory size = 128 bits

Referring to Table 2-4, the equivalent MCRF200

configuration is: “14D”.

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