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VR4102 Datasheet(PDF) 425 Page - NEC

Part # VR4102
Description  64/32-bit Microprocessor
PDF  701 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

VR4102 Datasheet(HTML) 425 Page - NEC

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CHAPTER 21 KIU (KEYBOARD INTERFACE UNIT)
425
21.2.2 KIUSCANREP (0x0B00 0190)
Bit
D15
D14
D13
D12
D11
D10
D9
D8
Name
KEYEN
Reserved
Reserved
Reserved
Reserved
Reserved
STPREP[5]
STPREP[4]
R/W
R/W
RR
RRR
R/W
R/W
RTCRST
0
0
0
0
0
0
0
0
Other resets
0
0
0
0
0
0
0
0
Bit
D7
D6D5
D4D3D2
D1
D0
Name
STPREP[3]
STPREP[2]
STPREP[1]
STPREP[0]
SCANSTP
SCANSTART
ATSTP
ATSCAN
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RTCRST
0
0
0
0
0
0
0
1
Other resets
0
0
0
0
0
0
0
1
Bit
Name
Function
D[15]
KEYEN
Key scan
1 : Enable
0 : Prohibit
D[14..10]
Reserved
Write 0 when writing. 0 is returned after a read.
D[9..4]
STPREP[5..0]
Key scan sequencer stop count setting
111111 : 63 times
:
000001 : 1 time
000000 : 64 times
D[3]
SCANSTP
Key scan stop
1 : Stop
0 : Operate
D[2]
SCANSTART
Key scan start
1 : Start
0 : Stop
D[1]
ATSTP
Key auto stop setting
1 : Auto stop
0 : Not auto stop
D[0]
ATSCAN
Key auto scan setting
1 : Auto scan
0 : Not auto scan
This register is used to enable operation of the key scan unit and to make settings for key scan and the key scan
sequencer.
• Key scan sequencer stop count setting
This sets the number of key scan sequencer stops when no keys are being pressed.



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