SM8212 datasheet(21/32 Pages) NPC

21 / 32 page

NIPPON PRECISION CIRCUITS-21

SM8212B

2. Parameter set flags (2)

Bit 14

NRZ input signal polarity select flag.

When 0, normal logic is selected.

When 1, inverse logic is selected.

Bits 15 to 20

BS3 (PLL setup signal) setup time set flags.

“M” represents the value of PL5 (MSB) to PL0 (LSB) and is used to

control the receive timing setup time before BS3 rising edge. The

setup time is 1.953xM ms (0.833xM ms) [0.417xM ms]. The valid

values are from 2 to 62 (61 steps). Note that 3F HEX is an invalid set-

ting.

Bits 21 to 26

BS1 (RF control main output signal) setup time set flags.

“N” represents the value of RF5 (MSB) to RF0 (LSB) and is used to

control the receive timing setup time before BS3 rising edge. The

setup time is 1.953xN ms (0.833xN ms) [0.417xN ms]. The valid val-

ues are from 2 to 62 (61 steps). Note that 3E and 3F HEX are invalid

settings.

Note also that the setup times should be set such that (BS3 rising-edge

setup time) > (BS1 rising-edge setup time).

Bit 27

NRZ signal input noise canceller filter ON/OFF flag.

When 0, filter is OFF.

When 1, filter is ON.

Bits 28 to 29

These bits set the noise canceller filter on-state (strength) when the fil-

ter is turned ON using bit 27.

Filter ON-state strength:

1 < 2 < 3 < 4

Bits 30 to 32

Preamble mode rate error detection condition set flags.

In preamble mode, under worst-case reception conditions, a single

standard is used when distinguishing between noise and preamble to

detect rate errors. These flags determine the rate error detection stan-

dard. The error counter value (number of permissible rate errors) can

be selected from the range 1 to 8.

Parameter setting flag

BS2 OPTION (BS2 option)

END OF MESSAGE DETECTION

SELECT CLKO FREQUENCY

KILL CLKO

BIT RATE SET 1 (BRS1)

BIT RATE SET 0 (BRS0)

SIGNAL POLARITY

PL5

PL4

PL3

PL2

PL1

PL0

RF5

RF4

RF3

RF2

RF1

RF0

FILTER ENABLE/ DISABLE

FILTER 1

FILTER 0

ERROR 2 (ER 2)

ERROR 1 (ER 1)

ERROR 0 (ER 0)

Table 5. Parameter set flags

Bits 12 to 13

Receive bit rate set flags.

BRS1

BRS0

Reception bit rate

512 bps

1200 bps

2400 bps

Can't accept

FILTER 1 FILTER 0

Filter strength

Filter strength 1

Filter strength 2

Filter strength 3

Filter strength 4

ER 2

ER 1

ER 0

Threshold

ER 2

ER 1

ER 0

Threshold

Count = 1

Count = 5

Count = 2

Count = 6

Count = 3

Count = 7

Count = 4

Count = 8

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