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EM78612
Universal Serial Bus Microcontroller Series
This specification may change without further notice. 4 3/5/2003 (V1.0)
5 Pin Description
Symbol I/O Function
OSCI I 6MHz / 12MHz ceramic resonator or crystal input.
OSCO I/O Return path for 6-MHz / 12MHz ceramic resonator or crystal.
V
NN
Used in programming the on-chip ROM. During normal operation, this pin is
connected to Ground.
V
3.3V
O
3.3V DC voltage output from internal regulator. This pin has to be tied to a
4.7μF capacitor.
P60/V
PP
I
P60 functins as an input pin only (no output) and can be used for AD function.
For serial signal transmission application, the Pin P60 is used as a serial signal
input pin. For detailed usage and function, refer to Section 8.8, Pattern
Detecting Application of this Spec.
P60 can be selected as pull high resistor or pull low resistor.
P61 ~ P67 I/O
7 GIOP pins.
The pull high resistors (200K Ohms) and pull low resistors (15K Ohm) are
selected through pin programming.
P70 ~ P73 I/O
Port7 offers up to 8 GIOP pins. The sink current of P70 & P71 are
programmable for driving LED.
Each pin has pull high resistors (200K 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 this pin is used as a PS/2 line interface, it will generate an interrupt when
its state changes.
D- / P51 I/O
USB Minus data line interface or PS/2 line interface are user-defined through
firmware setting.
This pin should be pulled-high with a 1.5K Ohm resistor to V
3.3V
pin for USB
mode application.
When this pin is used as a PS/2 line interface, it will generate an interrupt when
its state changes.
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 7.1 Pin Descriptions
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