UPD30121 datasheet(66/76 Pages) NEC

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Data Sheet U14691EJ1V0DS00

µµµµPD30121

(19) Serial interface parameter (1/2)

Parameter

Symbol

Condition

MIN.

MAX.

Unit

TxD output pulse width

Note

tTXD

N – 1

N + 1

µs

RxD input pulse width

Note

tRXD

(9/16)

× N

µs

IRDOUT# high-level output pulse width

Note

tIRDOUT

(3/16)

× N – 1

(3/16)

× N + 1

µs

IRDIN input pulse width

tIRDIN

µs

Note N: Data transfer rate per bit, which is determined by the divisor of the baud-rate generator that is set with

the SIUDLL and SIUDLM registers.

Baud Rate (bps)

SIUDLM, SIUDLL Resister

N (

µs)

23,040

20,000

15,360

13,333

110

10,473

9,091

134.5

8,565

7,435

150

7,680

6,667

300

3,840

3,333

600

1,920

1,667

1,200

920

833

1,800

640

556

2,000

573

500

2,400

480

417

3,600

320

278

4,800

240

208

7,200

160

139

9,600

120

104

19,200

52.1

38,400

26.0

56,000

17.9

128,000

7.81

144,000

6.94

192,000

5.21

230,400

4.34

288,000

3.47

384,000

2.60

576,000

1.74

1,152,000

0.868

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