em78p257 ELAN Microelectronics Corp, em78p257 Datasheet - Page 25

• Manufacturer Part Number: em78p257
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

This specification is subject to change without prior notice.
8. IOCC0 (Open-drain Control Register)
9. IOCD0 (Pull-high Control Register)
• Bit 6 (/PD56) Use to enable the pull-down of P56 pin. (for EM78P257B only)
• Bit 5 (/PD55) Use to enable the pull-down of P55 pin.
• Bit 4 (/PD54) Use to enable the pull-down of P54 pin.
• Bit 3 (/PD53) Use to enable the pull-down of P53 pin.
• Bit 2 (/PD52) Use to enable the pull-down of P52 pin.
• Bit 1 (/PD51) Use to enable the pull-down of P51 pin.
• Bit 0 (/PD50) Use to enable the pull-down of P50 pin.
• IOCB0 Register is both readable and writable.
• Bit 7 (OD67) Use to enable the open-drain of P67 pin.
• Bit 6 (OD66) Use to enable the open-drain of P66 pin.
• Bit 5 (OD65) Use to enable the open-drain of P65 pin.
• Bit 4 (OD64) Use to enable the open-drain of P64 pin.
• Bit 3 (OD63) Use to enable the open-drain of P63 pin.
• Bit 2 (OD62) Use to enable the open-drain of P62 pin.
• Bit 1 (OD61) Use to enable the open-drain of P61 pin.
• Bit 0 (OD60) Use to enable the open-drain of P60 pin.
• IOCC0 Register is both readable and writable.
• Bit 7 (/PH57) Use to enable the pull-high of P57 pin. (for EM78P257B only)
• Bit 6 (/PH56) Use to enable the pull-high of P56 pin. (for EM78P257B only)
• Bit 5 (/PH55) Use to enable the pull-high of P55 pin.
• Bit 4 (/PH54) Use to enable the pull-high of P54 pin.
• Bit 3 (/PH53) Use to enable the pull-high of P53 pin.
• Bit 2 (/PH52) Use to enable the pull-high of P52 pin.
• Bit 1 (/PH51) Use to enable the pull-high of P51 pin.
0: Disable open-drain output
1: Enable open-drain output
0: Enable internal pull-high
1: Disable internal pull-high
/PH57
OD67
7
7
/PH56
OD66
6
6
/PH55
OD65
5
5
/PH54
OD64
4
4
25
/PH53
OD63
3
3
/PH52
OD62
2
2
/PH51
OD61
1
1
EM78P257
07.27.2004 (V1.4)
OTP ROM
/PH50
OD60
0
0