EM78M612
Universal Serial Bus Microcontroller Series
6 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.
Used in programming the on-chip ROM. During normal operation, this pin is
VNN
connected to Ground.
3.3V DC voltage output from internal regulator. This pin has to be tied to a
V3.3V
O
I
4.7μF capacitor.
P60 functins as an input pin only (no output)
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/VPP
7 GIOP pins.
The pull high resistors (200K Ohms) and pull low resistors (15K Ohm) are
P61 ~ P67
I/O
I/O
selected through pin programming.
All Port6 I/O pins are used for AD function. Furthermore,P64 & P65 can also be
used for PWM function.
Port7 offers up to 8 GIOP pins. The sink current of P70 & P71 are
programmable for driving LED.
P70 ~ P77
Each pin has pull high resistors (200K Ohm) that can be selected through pin
programming.
All Port7 I/O pins can be used for AD function.
USB Plus data line interface or PS/2 line interface are user-defined through
firmware setting.
D+ / P50
D- / P51
I/O
I/O
When this pin is used as a PS/2 line interface, it will generate an interrupt when
its state changes.
USB Minus 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.
Connects to the USB power source or to a nominal 5V-power supply. Actual VDD
VDD
VSS
-
-
range can vary between 4.4V and 5.2V.
Connects to ground.
Table 7.1 Pin Descriptions
This specification may change without further notice.
2004/4/28 V1.1
6
ELAN [ ELAN MICROELECTRONICS CORP ]
