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EM78P221/2N
8-Bit Microcontroller with OTP ROM
Product Specification (V1.0) 10.19.2007 • 15
(This specification is subject to change without further notice)
6.2.19 Bank 1-RB (Pull-down Control Register)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
/PD7 /PD6 /PD5 /PD4 /PD3 /PD2 /PD1 /PD0
Bank 1-RB register is both readable and writable
Bit 7 (/PD7): Control bit used to enable the pull-down function of the P67 pin
0 = Enable internal pull-down function
1 = Disable internal pull-down function
Bit 6 (/PD6): Control bit used to enable the pull-down function of the P66 pin.
Bit 5 (/PD5): Control bit used to enable the pull-down function of the P65 pin.
Bit 4 (/PD4): Control bit used to enable the pull-down function of the P64 pin.
Bit 3 (/PD3): Control bit used to enable the pull-down function of the P63 pin.
Bit 2 (/PD2): Control bit used to enable the pull-down function of the P62 pin.
Bit 1 (/PD1): Control bit used to enable the pull-down function of the P61 pin.
Bit 0 (/PD0): Control bit used to enable the pull-down function of the P60 pin.
6.2.20 Bank 1-RC (Open-Drain Control Register)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
/OD7 /OD6 /OD3 /OD2 /OD5 /OD4 /OD1 /OD0
Bank 1-RC register is both readable and writable.
Bit 7 (OD7): Control bit used to enable the open-drain output of the P57 pin.
0 = Enable open-drain output
1 = Disable open-drain output
Bit 6 (OD6): Control bit used to enable the open-drain output of the P56 pin.
Bit 5 (OD5): Control bit used to enable the open-drain output of the P55 pin.
Bit 4 (OD4): Control bit used to enable the open-drain output of the P54 pin.
Bit 3 (OD3): Control bit used to enable the open-drain output of the P53 pin.
Bit 2 (OD2): Control bit used to enable the open-drain output of the P52 pin.
Bit 1 (OD1): Control bit used to enable the open-drain output of the P51 pin.
Bit 0 (OD0): Control bit used to enable the open-drain output of the P50 pin.