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EM78P458/459
OTP ROM
• Bit 4 (/PD4) Control bit is used to enable the pull-down of the P64 pin.
• Bit 5 (/PD5) Control bit is used to enable the pull-down of the P65 pin.
• Bit 6 (/PD6) Control bit is used to enable the pull-down of the P66 pin.
• Bit 7 (/PD7) Control bit is used to enable the pull-down of the P67 pin.
• IOCB0 register is both readable and writable.
7. IOCC0 (Open-Drain Control Register)
7 6 5 4 3 2 1 0
/OD7 /OD6 /OD5 /OD4 /OD3 /OD2 /OD1 /OD0
• Bit 0 (OD0) Control bit used to enable the open-drain of the P64 pin.
0: Enable open-drain output
1: Disable open-drain output
• Bit 1 (OD1) Control bit is used to enable the open-drain of the P65 pin.
• Bit 2 (OD2) Control bit is used to enable the open-drain of the P66 pin.
• Bit 3 (OD3) Control bit is used to enable the open-drain of the P67 pin.
• Bit 4 (OD4) Control bit is used to enable the open-drain of the P51 pin.
• Bit 5 (OD5) Control bit is used to enable the open-drain of the P52 pin.
• Bit 6 (OD6) Control bit is used to enable the open-drain of the P54 pin.
• Bit 7 (OD7) Control bit is used to enable the open-drain of the P57 pin.
• IOCC0 register is both readable and writable.
8. IOCD0 (Pull-high Control Register)
7 6 5 4 3 2 1 0
/PH7 /PH6 /PH5 - /PH3 /PH2 /PH1 /PH0
• Bit 0 (/PH0) Control bit is used to enable the pull-high of the P60 pin.
0: Enable internal pull-high;
1: Disable internal pull-high.
• Bit 1 (/PH1) Control bit is used to enable the pull-high of the P61 pin.
• Bit 2 (/PH2) Control bit is used to enable the pull-high of the P62 pin.
• Bit 3 (/PH3) Control bit is used to enable the pull-high of the P63 pin.
• Bit 4 Not used.
• Bit 5 (/PH5) Control bit is used to enable the pull-high of the P53 pin.
• Bit 6 (/PH6) Control bit is used to enable the pull-high of the P55 pin.
• Bit 7 (/PH7) Control bit is used to enable the pull-high of the P56 pin.
• IOCD0 register is both readable and writable.
This specification is subject to change without prior notice. 07.01.2003 (V1.3)
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