EM78159NAS EMC [ELAN Microelectronics Corp], EM78159NAS Datasheet - Page 16

• Manufacturer Part Number: EM78159NAS
• Description: 8-Bit Microcontroller with OTP ROM
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78P159N
8-Bit Microcontrollerwith OTP ROM
12 •
4.2.3 IOC5 ~ IOC6 (I/O Port Control Register)
4.2.4 IOCA (Prescaler Counter Register)
4.2.5 IOCB (Pull-Down Control Register)
Bit 0 (/PD0): Control bit is used to enable the pull-down of P50 pin.
Bit 1 (/PD1): Control bit is used to enable the pull-down of P51 pin.
Bit 2 (/PD2): Control bit is used to enable the pull-down of P52 pin.
Bit 3 (/PD3): Control bit is used to enable the pull-down of P53 pin.
Bit 4 (/PD4): Control bit is used to enable the pull-down of P60 pin.
Bit 5 (/PD5): Control bit is used to enable the pull-down of P61 pin.
Bit 6 (/PD6): Control bit is used to enable the pull-down of P62 pin.
Bit 7 (/PD7): Control bit is used to enable the pull-down of P63 pin.
IOCB Register is both readable and writable.
/PD7
Bit 7
"1" put the relative I/O pin into high impedance, while "0" defines the relative I/O pin
as output.
Only the lower 7 bits of IOC5 can be defined.
IOC5 and IOC6 registers are both readable and writable.
IOCA register is readable.
The value of IOCA is equal to the contents of Prescaler counter.
Down counter
0 = Enable internal pull-down
1 = Disable internal pull-down
/PD6
Bit 6
Bit 5
/PD5
Bit 4
/PD4
(This specification is subject to change without further notice)
/PD3
Bit 3
Product Specification (V1.0) 03.10.2006
/PD2
Bit 2
/PD1
Bit 1
Bit 0
/PD0