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4508 Datasheet(PDF) 77 Page - Renesas Technology Corp

Part # 4508
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4508 Datasheet(HTML) 77 Page - Renesas Technology Corp

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4508 Group
Rev.1.02
2006.12.22
page 77 of 140
REJ03B0148-0102
FR03
FR02
FR01
FR00
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output
Port P03 output structure selection bit
Port P02 output structure selection bit
Port P01 output structure selection bit
Port P00 output structure selection bit
Port output structure control register FR0
at reset : 00002
at RAM back-up : state retained
0
1
0
1
0
1
0
1
FR13
FR12
FR11
FR10
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output
Port P13 output structure selection bit
Port P12 output structure selection bit
Port P11 output structure selection bit
Port P10 output structure selection bit
Port output structure control register FR1
at reset : 00002
at RAM back-up : state retained
0
1
0
1
0
1
0
1
FR33
FR32
FR31
FR30
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output
Port D3 output structure selection bit
Port D2 output structure selection bit
Port D1 output structure selection bit
Port D0 output structure selection bit
Port output structure control register FR3
at reset : 00002
at RAM back-up : state retained
0
1
0
1
0
1
0
1
Notes 1: “R” represents read enabled, and “W” represents write enabled.
W
TFR0A
W
TFR1A
W
TFR3A
FR23
FR22
FR21
FR20
This bit has no function, but read/write is enabled.
This bit has no function, but read/write is enabled.
Not used
Not used
Port P21 output structure selection bit
Port P20 output structure selection bit
Port output structure control register FR2
at reset : 00002
at RAM back-up : state retained
0
1
0
1
0
1
0
1
W
TFR2A
N-channel open-drain output
CMOS output
N-channel open-drain output
CMOS output


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