PD17012_15 Datasheet, PDF (242/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
Figure 20-8. Key Source Signal and Key Input Timing
COM2 pin
COM1 pin
COM0 pin
Dot A
Dot B
Dot C
Segment signal
Key source signal
Each segment/key source signal output pin (LCDn/KSn)
Each segment pin (pin outputting "1" as key source, A = on, B = on, C = off)
H
Segment pin
L
Pull down
Key input pin
Open
1
KEYJ flag
0
Key source signal
220 µs
2 ms
2 ms
PUT KSR, DBF or
SKT 1 KEYJ
PUT KSR, DBF or
SKT1 KEYJ
Signal input to P0D3/K3 to P0D0/K0 pins is connected to input latch during this period.
If PUT KSR, DBF is executed during this period, KEYJ flag is not set for 4 ms.
Input data is latched at this point.
Caution The KEYJ flag is not set to 1 when in HALT mode.
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Data Sheet U10101EJ4V0DS