UPD30121 NEC [NEC], UPD30121 Datasheet - Page 64

• Manufacturer Part Number: UPD30121
• Description: VR4121TM 64-/32-BIT MICROPROCESSOR
• Manufacturer: NEC [NEC]

64
KSCAN (0:11) high-level width
Idle time (KSCAN (n+1)
Key scan interval time
Key input setup time (to KSCANn )
Key input hold time (from KSCANn )
(18) Keyboard Interface parameter (1/2)
Notes 1. K: Sum of the values set to the T1CNT (0:4) bits and T2CNT (0:4) bits of the KIUWKS register
Remark n = 0 to 10
(a) Keyboard scan parameter 1
(b) Keyboard scan parameter 2
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
KSCAN (n + 1)
KSCAN11
KSCAN0
KSCAN1
KSCAN2
(output)
(output)
(output)
(output)
KSCANn
Parameter
(output)
(output)
from KSCANn )
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
t
KWAIT
Data Sheet U14691EJ1V0DS00
Symbol
t
t
t
KWAIT
t
KWAIT
SCAN
t
t
SCAN
t
KS
KH
Hi-Z
KI
Condition
Hi-Z
Hi-Z
Hi-Z
30 (K + 2) – 1
30 (N + 1) – 1
30 (L + 1) – 1
t
KWAIT
30M – 1
t
KWAIT
MIN.
0
Hi-Z
+ t
KI
Hi-Z
30.16 (K + 2) + 1
30.16 (L + 1) + 1
30.16M + 1
MAX.
Unit
PD30121
s
s
s
s
s