EM78M611E
Universal Serial Bus Series Microcontroller
6
••••
Product Specification (V1.1) 11.22.2006
(This specification is subject to change without further notice)
6 Pin Description
Symbol
I/O
Function
P50 ~ P57
I/O
General 8-bit bidirectional input/output port. All pins on this port can be
internally pulled-high by software control.
P60 ~ P67
I/O
General 8-bit bidirectional input/output port. All pins on this port can be
internally pulled-high by software control.
P70 ~ P72
P76 ~ P77
I/O
LED sink pins
P76 ~ P77 will have an internally pulled-high resistor when the EM78M611E is
running in PS/2 mode.
P80 ~ P87
I/O
General 8-bit bidirectional input/output port. All pins on this port can be
internally pulled-high by software control.
P90 ~ P93
P95 ~ P96
I/O
General 6-bit bidirectional input/output port. All pins on this port can be
internally pulled-high by software control or LED sink pins.
P94 / Vpp
I
Input only. MTP program pin.
PWM1
PWM2
O
PWM output pins.
D+/CLK/P74
I/O
USB plus data line interface or CLK for PS/2 keyboard.
When the EM78M611E is running in PS/2 mode, this pin will have an internal
pulled-high resistor (2.2K
Ω
), with VDD=5.0V.
D-/DATA/P75
I/O
USB minus data line interface or DATA for PS/2 keyboard.
When the EM78M611E is running in PS/2 mode, this pin will have an internal
pulled-high resistor (2.2K
Ω
), with V
3.3
=3.3V.
When the EM78M611E is running in USB mode, this pin will have an internal
pulled-high resistor (1.5K
Ω
), with VDD=3.3V.
OSCI
I
6MHz / 12MHz ceramic resonator input.
OSCO
O
Return path for 6MHz / 12MHz ceramic resonator.
VNN
−
MTP program pin. Used in programming the on-chip ROM. During normal
operation, this pin is connected to Ground.
V3.3
PWR
3.3V regulator output
VDD
PWR
Power supply pin
GND
PWR
Ground pin