UPD30121 datasheet(64/76 Pages) NEC

64 / 76 page

Data Sheet U14691EJ1V0DS00

µµµµPD30121

(18) Keyboard Interface parameter (1/2)

Parameter

Symbol

Condition

MIN.

MAX.

Unit

KSCAN (0:11) high-level width

tSCAN

30 (K + 2) – 1

30.16 (K + 2) + 1

µs

Idle time (KSCAN (n+1)

↑ from KSCANn ↓)tKWAIT

30 (L + 1) – 1

30.16 (L + 1) + 1

µs

Key scan interval time

tKI

30M – 1

30.16M + 1

µs

Key input setup time (to KSCANn

↑)tKS

30 (N + 1) – 1

µs

Key input hold time (from KSCANn

↑)tKH

µs

Notes 1. K: Sum of the values set to the T1CNT (0:4) bits and T2CNT (0:4) bits of the KIUWKS register

2. L: Value set to the T3CNT (0:4) bits of the KIUWKS register

3. M: Value set to KIUWKI register

4. N: Value set to the T1CNT (0:4) bits of the KIUWKS register

5. n = 0 to 11

(a) Keyboard scan parameter 1

Hi-Z

tSCAN

tKWAIT

KSCANn

(output)

KSCAN (n + 1)

(output)

Remark n = 0 to 10

(b) Keyboard scan parameter 2

Hi-Z

tKWAIT

KSCAN0

(output)

KSCAN11

(output)

Hi-Z

KSCAN1

(output)

KSCAN2

(output)

Hi-Z

tKWAIT + tKI

tKWAIT

UPD30121 Datasheet(PDF) 64 Page - NEC

UPD30121 Datasheet(HTML) 64 Page - NEC

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

Datasheet Download

Link URL