EM78P259N/260N
8-Bit Microprocessor with OTP ROM
20 • Product Specification (V1.2) 05.18.2007
(This specification is subject to change without further notice)
6.2.7 IOCB0 (Pull-down Control Register)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
/PD57 /PD56 /PD55 /PD54 /PD53 /PD52 /PD51 /PD50
Note: The IOCB0 register is both readable and writable
Bit 7 (/PD57): Control bit used to enable the pull-down function of the P57 pin
(applicable to EM78P260N only)
0 = Enable internal pull-down
1 = Disable internal pull-down
Bit 6 (/PD56): Control bit used to enable the pull-down function of the P56 pin
(applicable to EM78P260N only)
Bit 5 (/PD55): Control bit used to enable the pull-down function of the P55 pin
Bit 4 (/PD54): Control bit used to enable the pull-down function of the P54 pin
Bit 3 (/PD53): Control bit used to enable the pull-down function of the P53 pin
Bit 2 (/PD52): Control bit used to enable the pull-down function of the P52 pin
Bit 1 (/PD51): Control bit used to enable the pull-down function of the P51 pin
Bit 0 (/PD50): Control bit used to enable the pull-down function of the P50 pin.
6.2.8 IOCC0 (Open-Drain Control Register)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
/OD67 /OD66 /OD65 /OD64 /OD63 /OD62 /OD61 /OD60
Note: The IOCC0 register is both readable and writable
Bit 7 (/OD67): Control bit used to enable the open-drain output of the P67 pin
0 = Enable open-drain output
1 = Disable open-drain output
Bit 6 (/OD66): Control bit used to enable the open-drain output of the P66 pin
Bit 5 (/OD65): Control bit used to enable the open-drain output of the P65 pin
Bit 4 (/OD64): Control bit used to enable the open-drain output of the P64 pin
Bit 3 (/OD63): Control bit used to enable the open-drain output of the P63 pin
Bit 2 (/OD62): Control bit used to enable the open-drain output of the P62 pin
Bit 1 (/OD61): Control bit used to enable the open-drain output of the P61 pin
Bit 0 (/OD60): Control bit used to enable the open-drain output of the P60 pin