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EM78612
Universal Serial Bus Microcontroller
Product Specification (V1.0) 03.22.2006 •
••
• 7
(This specification is subject to change without further notice)
5 Pin Description
Symbol I/O Function
OSCI I 6MHz / 12MHz ceramic resonator input.
OSCO I/O
Return path for 6MHz / 12MHz ceramic resonator.
V
3.3V
O
3.3V DC voltage output from internal regulator. This pin should be tied to a
4.7 F decoupling capacitor to GND.
P60 ~ P67 I/O
Port6 offers up to 8 GIOP pins.
The pull high resistors (132K Ohms) and pull low resistors (10K Ohm) are
selected through pin programming.
P70 ~ P73 I/O
Port7 offers up to 4 GIOP pins. The sink current of P70 & P71 are programmable
for driving LED.
Each pin has pull high resistors (132K Ohm) that can be selected through pin
programming.
D+ / P50 I/O
USB Plus data line interface or PS/2 line interface are user-defined through
firmware setting.
When the EM78612 is running under PS/2 mode, this pin will have an internal
pulled-high resistor (2.2K Ohm), with V
DD
=5.0V.
When this pin is used as a PS/2 line interface, it will generate an interrupt when
its state changes (Port5 state change interrupt enable).
D- / P51 I/O
USB Minus data line interface or PS/2 line interface are user-defined through
firmware setting.
When the EM78612 is running under PS/2 mode, this pin will have an internal
pulled-high resistor (2.2K Ohm), with V
DD
=5.0V.
When this pin is used as a PS/2 line interface, it will generate an interrupt when
its state changes (Port5 state change interrupt enable).
When the EM78612 is running under USB mode, this pin will have an internal
pulled-high resistor, 1.5k Ohm, with V
3.3
=3.3V.
V
DD
-
Connects to the USB power source or to a nominal 5V-power supply. Actual V
DD
range can vary between 4.4V and 5.2V.
V
SS
-
Connects to ground.
Table 5-1 Pin Descriptions