SM8213 datasheet(22/33 Pages) NPC

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SM8213AM

NIPPON PRECISION CIRCUITS—22

Bit 11

CLKO clock output enable ﬂag.

When 0, output is enabled.

When 1, output is disabled.

If CLKO clock output is not used, it can be useful in

preventing unwanted noise generation.

Bits 12 to 13

Receive bit rate set ﬂags.

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

1.953M ms (0.833M ms) [0.417M ms]. The valid

values are from 2 to 62 (61 steps). Note that 3FH is

an invalid setting.

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

1.953N ms (0.833N ms) [0.417N ms]. The valid val-

ues are from 2 to 62 (61 steps). Note that 3EH and

3FH 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 ﬁlter is turned ON using bit 27.

Bits 30 to 32

Preamble mode rate error detection condition set

ﬂags.

In preamble mode, under worst-case reception con-

ditions, 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.

BRS1

BRS0

Reception bit rate

512 bps

1200 bps

2400 bps

Can't accept

FILTER 1

FILTER 0

Filter strength1

1. Filter ON-state strength: 1 < 2 < 3 < 4

Filter strength 1

Filter strength 2

Filter strength 3

Filter strength 4

ER 2

ER 1

ER 0

Threshold

Count = 1

Count = 2

Count = 3

Count = 4

Count = 5

Count = 6

Count = 7

Count = 8

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