EM78612
Universal Serial Bus Microcontroller
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•Product Specification(V1.0)03.2 2.2006
(This specification is subject to changewithout further notice)
IOC5 (Data Line I/O Control Register) Default Value: (0B_0000_0011)
76543210
0 0 0 0 0 0 P51 P50
IOC5 [2~7] Undefined registers. The def ault value is 0.
IOC6 (Port 6 I/O Control Register) Default Value: (0B_1111_1111)
7 6 5 4 3 2 1 0
P67 P66 P65 P64 P63 P62 P61 P60
IOC7 (Port 7 I/O Control Register) Default Value: (0B_0000_1111)
7 6 5 4 3 2 1 0
- - - - P73 P72 P71 P70
IOC8 (Sink Current Control Register) Default Value: (0B_0000_0000)
7 6 5 4 3 2 1 0
0 0 Sink1.1 Sink1.0 0 0 Sink01 Sink0.0
IOC8 [0,1][4,5] are P70/P71 sink current control registers. Four leve ls are offered for
selection:
Sink0.1/1.1 Sink0.0/1.0 Sink Current
0 0 3mA±10%
0 1 6mA±10%
1 0 12mA±10%
1 1 25mA±10%
The default current after Power-on reset is 3mA.
IOCA (Operation Mode Control Register) Default Value: (0B_1100_0011)
7 6 5 4 3 2 1 0
Dual_Frq.1 Dual_Frq.0 0 0 0 0 PS/2 USB
IOCA [0,1] These two bits are used to select the operation mode. The def inition of
these two control registers is described in the table below.
IOCA[1] IOCA[0] Operation Mode
0 0 Detect Mode
0 1 USB Mode