PC87351 datasheet(81/86 Pages) NSC

81 / 86 page

11.0 Device Characteristics (Continued)

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11.2.7

Serial Port, Sharp-IR, SIR and Consumer Remote Control Timing

1. tBTN is the nominal bit time in Serial Port, Sharp-IR, SIR and Consumer Remote Control modes. It is deter-

mined by the setting of the Baud Generator Divisor registers

2. tCWN is the nominal pulse width of the modulation signal for Sharp-IR and Consumer Remote Control modes. It

is determined by the MCPW ﬁeld (bits 7-5) of the IRTXMC register and the TXHSC bit (bit 2) of the RCCFG

3. tCPN is the nominal period of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is deter-

mined by the MCFR ﬁeld (bits 4-0) of the IRTXMC register and the TXHSC bit (bit 2) of the RCCFG register.

4. tMMIN and tMMAX deﬁne the time range within which the period of the incoming subcarrier signal has to fall in

order for the signal to be accepted by the receiver. These time values are determined by the contents of regis-

ter IRRXDC and the setting of the RXHSC bit (bit 5) of the RCCFG register

Symbol Parameter

Conditions

Min

Max

Unit

tBT

Single Bit Time in Serial Port and Sharp-IR

Transmitter

tBTN − 25

tBTN + 25

nsec

Receiver

tBTN − 2%

tBTN + 2%

nsec

tCMW

Modulation Signal Pulse Width in Sharp-IR

and Consumer Remote Control

Transmitter

tCWN − 25

tCWN + 25

nsec

Receiver

500

nsec

tCMP

Modulation Signal Period in Sharp-IR and

Consumer Remote Control

Transmitter

tCPN − 25

tCPN + 25

nsec

Receiver

tMMIN

tMMAX

nsec

tSPW

SIR Signal Pulse Width

Transmitter,

Variable

(3/16) x tBTN − 15

(3/16) x tBTN + 15

nsec

Transmitter,

Fixed

1.48

1.78

µsec

Receiver

1.00

µsec

SDRT

SIR Data Rate Tolerance.

% of Nominal Data Rate.

Transmitter

± 0.87%

Receiver

± 2.0%

tSJT

SIR Leading Edge Jitter

% of Nominal Bit Duration.

Transmitter

± 2.5%

Receiver

± 6.5%

Serial Port

tCMW

tCMP

Sharp-IR

Consumer Remote Control

tBT

SIR

tSPW

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