HCS410 datasheet(21/36 Pages) MICROCHIP

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HCS410

 2001 Microchip Technology Inc.

Preliminary

DS40158E-page 21

3.7.5

MTX3: MINIMUM CODE WORDS

COMPLETED

If this bit is set, the HCS410 will transmit a minimum of

3 words before it powers itself down. If this bit is

cleared, the HCS410 will only complete the current

transmission. This feature will only work if VDD is con-

nected directly to the battery as shown in Figure 2-1.

3.7.6

VLOW: LOW VOLTAGE TRIP POINT

The low voltage trip point select bit is used to tell the

HCS410 what Vdd level is being used. This information

will be used by the device to determine when to send

the voltage low signal to the receiver. When this bit is

set, the Vdd level is assumed to be operating from a 5

volt or 6 volt supply. If the bit is cleared, then the Vdd

level is assumed to be 3.0 volts. Refer to Figure 5-3 for

voltage trip point. When the battery reaches the Vlow

point, the LED will flash once for 200 ms on during a

code hopping transmission.

3.7.7

LED: OUTPUT ENABLE

If this bit is set, the S2 doubles as an LED output line.

If this bit is cleared (0), S2 is only used as an input.

3.7.8

TBSL: TRANSPONDER BAUD RATE

SELECT

This option selects the baud rate for IFF communica-

tion between a TE of 100 µs or 200 µs.

3.7.9

MANCH: MANCHESTER CODE

ENCODING

MANCH selects between Manchester code modulation

and PWM modulation in code hopping mode. If

MANCH = 1, Manchester code modulation is selected.

If MANCH is cleared, PWM modulation is selected.

3.7.10

ACOLI: ANTI-COLLISION

COMMUNICATION AND

XPRF: TRANSPONDER ECHOING

ON PWM OUTPUT

ACOLI = 1, XPRF = 0

If ACOLI is set the anti-collision operation during bi-

directional transponder mode (IFF) is enabled. This

feature is useful in situations where multiple transpon-

ders enter the magnetic field simultaneously.

ACOLI = 0, XPRF = 1

If XPRF is set, and ACOLI is cleared, proximity activa-

tion is enabled. the HCS410 starts sending out ACK

pulses when it detects a magnetic field. If the HCS410

doesn’t receive a start bit from the decoder within 50

ms of sending the first set of ACK pulses, the HCS410

will transmit a code hopping transmission PWM pin for

2 seconds.

ACOLI = 1, XPRF = 1

If both the ACOLI and XPRF are set, all of the HCS410

transponder responses are echoed on the PWM out-

put, as described in Section 2.6.2.

3.7.11

DINC: DELAYED INCREMENT

If DINC is set to ‘1’, the delayed increment feature is

enabled. If DINC is cleared, the counter only incre-

ments once each time the button is pressed.

3.7.12

XSER: EXTENDED SERIAL NUMBER

If XSER is set, bits 60 to 63 of the transmission are the

most significant bits of the serial number or seed. If

XSER bit is cleared, bits 60 to 63 of the transmission

are set to the function code used to activate the device

(S2:S1:S0:0).

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