EM78612
Universal Serial Bus Microcontroller
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•Product Specification(V1.0)03.2 2.2006
(This specification is subject to changewithout further notice)
7.3 I/O Ports
The EM78612 has up totwelve General Purposes I/O pins, which are classifies into two
port groups; Port 6 and Port 7. Each pin has an internal resistor that can be individually
selected by user.
The following describes the important features o EM78612 I /O pins.
7.3.1 Programmable Large Current
Port 7 has two pins; P70 and P71 that can drive large current of up to 30mA. The range
of driving current is from 3mA to 30mA, which is programmable. Use IOC8 [0,1] and
IOC8 [4,5] to control the sink current of P70/P71. The d efault current is 3mA.
7.3.2 Wakeup by Port Change Function
Each of the GPIO pins in Port 6 and Port 7 can wakeup the MCU through signal change
from input pin. This function is used to wake-up the MCU automatically from sleep
mode. It also supports the remote wake-up function for USB application.