Справочник Пользователя для IBM EM78P259N/260N
EM78P259N/260N
8-Bit Microprocessor with OTP ROM
20
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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)
(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