參數(shù)資料
型號(hào)： EM78612
英文描述： Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 16-QFN
中文描述： USB控制器
文件頁(yè)數(shù)： 11/29頁(yè)
文件大小： 692K
代理商： EM78612
EM78612
Universal Serial Bus Microcontroller Series
This specification may change without further notice.
19
3/5/2003 (V1.0)
IOCF (Interrupt Mask Register)
Default Value: (0B_0000_0000)
7
6
5
4
3
2
1
0
-
Port 5 State
Change_IE
USB Host
Resume_1E
USB
Reset_IE
USB
Suspend_IE
EP0_IE
TCC_IE
IOCF [0~5] TCC / EP0 / USB Suspend / USB Reset / USB Host Resume / Port 5 State
Change enable bits. These eight bits respectively control the function of TCC
interrupt, EP0 interrupt, USB Suspend interrupt, USB Reset interrupt, USB
Host Resume interrupt, Port5 State Change interrupt, Individual interrupt is
enabled by setting its associated control bit in the IOCF to "1".
1: Enable Interrupt.
0: Disable Interrupt.
Only when the global interrupt is enabled by the ENI instruction that the individual interrupt
will work. After DISI instruction, any interrupt will not work even if the respective control bits
of IOCF are set to 1.
The USB Host Resume Interrupt works only under Dual clock mode. This is because when
the MCU is under sleep mode, it will be waked up by the UDC Resume signal automatically.
8.2.2 USB Application FIFOs
For USB Application, EM78612 provides an 8-byte First-In-First-Out (FIFO) buffer for each
endpoint. The buffer cannot be accessed directly. However, a corresponding Data Byte
Pointer register for each endpoint is made available to address the individual byte of the
FIFO buffer. The content of the individual byte will map to a special register.
8.3
I/O Ports
The EM78612 has up to sixteen General Purposes I/O pins, which are classifies into two
port groups; Port 6 and Port 7. Each pin has an internal resistor that can be individually
selected by user. Notice that Port 6 is a input only port, that is, pins of Port6 can only be
input direction.
The following describes the important features of EM78612 I/O pins.
8.3.1 Programmable Large Current
Port 7 has two pins; P70 and P71 that can drive large current of up to 30mA. The range of
driving current is from 3mA to 30mA, which is programmable. Use IOC8 [0,1] and IOC8 [4,5]
to control the sink current of P70/P71. The default current is 3mA.
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