em78p131a ELAN Microelectronics Corp, em78p131a Datasheet - Page 14

• Manufacturer Part Number: em78p131a
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

EM78P131A
8-Bit Microcontroller with OTP ROM
10 •
5.2.4 IOCB (Pull-down Control Register)
Bit 0~3:
Bit 4 (/PD4): Control bit used to enable pull-down of the 60 pin.
Bit 5 (/PD5): Control bit used to enable pull-down of the 61 pin.
Bit 6 (/PD6): Control bit used to enable pull-down of the 62 pin.
Bit 7:
The IOCB Register is both readable and writable.
5.2.5 IOCC (Open-drain Control Register)
Bit 0 (OD0): Control bit used to enable open-drain of the P60 pin.
Bit 1 (OD1): Control bit used to enable open-drain of the P61 pin.
Bit 2 (OD2): Control bit used to enable open-drain of the P62 pin.
Bit 3:
Bit 4 (OD4): Control bit used to enable open-drain of the P64 pin.
Bit 5 (OD5): Control bit used to enable open-drain of the P65 pin.
Bit 6 (OD6): Control bit used to enable open-drain of the P66 pin.
Bit 7 (OD7): Control bit used to enable open-drain of the P67 pin.
The IOCC Register is both readable and writable.
5.2.6 IOCD (Pull-high Control Register)
Bit 0 (/PH0): Control bit used to enable pull-high of the P60 pin.
Bit 1 (/PH1): Control bit used to enable pull-high of the P61 pin.
/PH7
Bit 7
Bit 7
Bit 7
OD7
-
Not used
0 : Disable open-drain output
1 : Enable open-drain output
Not used
Not used
0 : Enable internal pull-high
1 : Disable internal pull-high
/PD6
Bit 6
/PH6
Bit 6
OD6
Bit 6
Bit 5
/PD5
Bit 5
Bit 5
/PH5
OD5
Bit 4
/PD4
Bit 4
OD4
Bit 4
/PH4
(This specification is subject to change without further notice)
Bit 3
Bit 3
Bit 3
Product Specification (V1.2) 09.16.2009
-
-
-
Bit 2
/PH2
Bit 2
OD2
Bit 2
-
Bit 1
Bit 1
OD1
Bit 1
/PH1
-
Bit 0
/PH0
Bit 0
OD0
Bit 0
-