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78P156 Datasheet(PDF) 7 Page - ELAN Microelectronics Corp

Part # 78P156
Description  8-bit microprocessor with low-power and high-speed CMOS technology
PDF  28 Pages
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

78P156 Datasheet(HTML) 7 Page - ELAN Microelectronics Corp

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* This specification is subject to be changed without notice. 8.11.1999
B3-7
EM78P156E
5.
IOCB (Pull-down Control Register)
765
43
2
1
0
/PD7
/PD6
/PD5
/PD4
-
/PD2
/PD1
/PD0
Bit 0 (/PD0)
Control bit used to enable the pull-down of P50 pin.
0: Enable internal pull-down
1: Disable internal pull-down
Bit 1 (/PD1)
Control bit used to enable the pull-down of P51 pin.
Bit 2 (/PD2)
Control bit used to enable the pull-down of P52 pin.
Bit 3
Not used.
Bit 4 (/PD4)
Control bit used to enable the pull-down of P60 pin.
Bit 5 (/PD5)
Control bit used to enable the pull-down of P61 pin.
Bit 6 (/PD6)
Control bit used to enable the pull-down of P62 pin.
Bit 7 (/PD7)
Control bit used to enable the pull-down of P63 pin.
•
IOCB register is both readable and writable.
6. IOCC (Open-drain Control Register)
765
43
2
1
0
OD7
OD6
OD5
OD4
OD3
OD2
OD1
OD0
Bit 0 (OD0)
Control bit used to enable the open-drain of P60 pin.
0: Disable open-drain output
1: Enable open-drain output
Bit 1 (OD1)
Control bit used to enable the open-drain of P61 pin.
Bit 2 (OD2)
Control bit used to enable the open-drain of P62 pin.
Bit 3 (OD3)
Control bit used to enable the open-drain of P63 pin.
Bit 4 (OD4)
Control bit used to enable the open-drain of P64 pin.
Bit 5 (OD5)
Control bit used to enable the open-drain of P65 pin.
Bit 6 (OD6)
Control bit used to enable the open-drain of P66 pin.
Bit 7 (OD7)
Control bit used to enable the open-drain of P67 pin.
•
IOCC register is both readable and writable.
7. IOCD (Pull-high Control Register)
765
43
2
1
0
/PH7
/PH6
/PH5
/PH4
/PH3
/PH2
/PH1
/PH0
Bit 0 (/PH0)
Control bit used to enable the pull-high of P60 pin.
0: Enable internal pull-high
1: Disable internal pull-high
Bit 1 (/PH1)
Control bit used to enable the pull-high of P61 pin.
Bit 2 (/PH2)
Control bit used to enable the pull-high of P62 pin.
Bit 3 (/PH3)
Control bit used to enable the pull-high of P63 pin.
Bit 4 (/PH4)
Control bit used to enable the pull-high of P64 pin.
Bit 5 (/PH5)
Control bit used to enable the pull-high of P65 pin.



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