PC97307 datasheet(199/218 Pages) NSC

199 / 218 page

199

Device Description

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13.3.7

UART, Sharp-IR and Consumer-IR Timing

TABLE 13-41. UART, Sharp-IR and Consumer Remote Control Timing

FIGURE 13-11. UART, Sharp-IR and Consumer Remote Control Timing

a. tBTN is the nominal bit time in UART, Sharp-IR, SIR and Consumer Remote Control modes. It is determined by

the setting of the Baud Rate Generator Divisor registers BGDL and BGDH at offsets 00h and 01h, respectively.

b. 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 at offset 01h and the TXHSC bit (bit 2) in

the RCCFG register at offset 02h. Both registers are in bank 7 of logical device 5.

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

determined by the MCFR ﬁeld (bits 4-0) of the IRTXMC register at offset 01h and the TXHSC bit (bit 2) of the

RCCFG register at offset 02h. Both registers are in bank 7 of logical device 5.

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

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

ter IRRXDC at offset 00h and the setting of the RXHSC bit (bit 5) in the RCCFG register at offset 02h. Both

registers are in bank 7 of logical device 5.

Symbol

Parameter

Conditions

Min

Max

Unit

tBT

Single Bit Time in UART and Sharp-IR

Transmitter

tBTN − 30

tBTN + 30

nsec

Receiver

tBTN − 2%

tBTN + 2%

nsec

tCMW

Modulation Signal Pulse Width in Sharp-IR and

Consumer Remote Control

Transmitter

tCWN − 30

tCWN + 30

nsec

Receiver

500

nsec

tCMP

Modulation Signal Period in Sharp-IR and

Consumer Remote Control

Transmitter

tCPN − 30

tCPN + 30

nsec

Receiver

tMMIN

tMMAX

nsec

UART

tCMW

tCMP

Sharp-IR

Consumer Remote Control

tBT

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