EM78P468NBQ EMC [ELAN Microelectronics Corp], EM78P468NBQ Datasheet - Page 33

• Manufacturer Part Number: EM78P468NBQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

Product Specification (V1.2) 03.15.2005
(This specification is subject to change without further notice)
4.4 I/O Ports
The I/O registers, (PORT 5, PORT 6, PORT 7and PORT 8), are bi-directional tri-state I/O
ports. PORT 6 and PORT 8
pulled-low int
through software. PORT 6 and
wa
or "output" pin by the I/O control register (IOC50 ~ IOC80). The I/O registers and I/
control registers are both readable and writable. The I/O interface circuits are show
Fig. 8
NOTE: Open-drain, pull high, and pull down are not shown in the figure.
ke
-up) function and is pull
Fig. 8 The Circuit of I/O Port and I/O Control Register for PORT 5 ~ 8
ernally by software. F
ed-high by software. Each I/O pin can be defined as "input"
are pulled-high internally by software; PORT 6 is also
PORT 8 features an input status changed interrupt (or
urthermore, PORT 6 has its open-drain output also
8-BIT Microcontroller
EM78P468N
• 29
n in
O