EM78612
Universal Serial Bus Microcontroller

30 •

••

•Product Specification(V1.0)03.2 2.2006

(This specification is subject to changewithout further notice)
10 Application Cricuit
P51
J1
USB connector
1
2
3
4
C5
30pF

USB Application

Note3. IF IOCA = PS/2 mode, MCU CLK and DATA pin
internal pull-high to VDD with 4.7k resistor.
Note :
Y1
6MHz or 12MHz resonator
P51

PS/2 Application

B. Place Y1, C4 and C5 close to MCU OSCI pin.
C3
4.7uF
P50
P50
VDDV3.3
D. Port6 and Port7 are 3.3V level I/O.
Note2. IF IOCA = USB test mode, it is necessary that
D- pin external pull-high to V3.3 with 1.5k
resistor.
VDD
V3.3
VDD
R1
1.5k
C2
0.1uF
EM78612_CP
VDD
D+/CLK
D-/DATA
NA
P67
P66
P65
P64P60
P70 P71
OSCI
P61
OSCO
P62
P63
P72 P73
VSS
V3.3
P50
C4
30pF
A. Place C1 and C2 close to MCU VDD pin.
C1
10uF
J2
PS/2 connector
5
3
1 2
4
6
E. Port60 is input only and without internal pull-high and pull-low resistor.
P51
C. In USB application, it is necessary to place C3 close to MCU V3.3 pin.
Note1. IF IOCA = USB mode, MCU D- pin internal
pull-high to V3.3 with 1.5k resistor.