em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 56

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
46 •
The IOCB Register is both readable and writable.
6.2.10 IOCC (Open-Drain Control Register)
Bit 7 (OD67): Control bit used to enable open-drain output of the P67 pin.
Bit 6 (OD66): Control bit used to enable open-drain output on P66 pin
Bit 5 (OD65): Control bit used to enable open-drain output on P65 pin
Bit 4 (OD64): Control bit used to enable open-drain output on P64 pin
Bit 3 (OD63): Control bit used to enable open-drain output on P63 pin
Bit 2 (OD62): Control bit used to enable open-drain output on P62 pin
Bit 1 (OD61): Control bit used to enable open-drain output on P61 pin
Bit 0 (OD60): Control bit used to enable open-drain output on P60 pin
The IOCC Register is both readable and writable.
6.2.11 IOCD (Pull-High Control Register 2)
Bit 7 (/PH67): Control bit used to enable pull-high of the P67 pin.
Bit 6 (/PH66): Control bit used to enable pull-high on P66 pin
Bit 5 (/PH65): Control bit used to enable pull-high on P65 pin
Bit 4 (/PH64): Control bit used to enable pull-high on P64 pin
Bit 3 (/PH63): Control bit used to enable pull-high on P63 pin
Bit 2 (/PH62): Control bit used to enable pull-high on P62 pin
/PH67
OD67
Bit 7
Bit 7
For F642/542N, Bit 3 ~ Bit 1 are unused. Set to “1” all the time.
For F641/541N, Bit 3 ~ Bit 1 are unused. Set to “1” all the time.
/PH66
OD66
Bit 6
Bit 6
0: Disable open-drain output
1: Enable open-drain output
0: Enable internal pull-high
1: Disable internal pull-high
For F641/541N, Bit 7 ~ Bit 6 are unused. Set to “0” all the time.
/PH65
OD65
Bit 5
Bit 5
/PH64
OD64
Bit 4
Bit 4
(This specification is subject to change without further notice)
NOTE
NOTE
/PH63
OD63
Bit 3
Bit 3
Product Specification (V1.0) 05.05.2010
/PH62
OD62
Bit 2
Bit 2
/PH61
OD61
Bit 1
Bit 1
/PH60
OD60
Bit 0
Bit 0