參數(shù)資料
型號： M30240F7
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機
文件頁數(shù)： 45/142頁
文件大?。?/td> 1637K
代理商： M30240F7
1-45
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Preliminary Specifications REV. E
Specifications in this manual are tentative and subject to change
Universal Serial Bus
2.18.1.2 Generic Function Interface
The GFI handles all USB standard requests from the host through the control endpoint (endpoint zero), han-
dles Bulk, Isochronous and Interrupt transfers through endpoints 1-4. The GFI handles read pointer reversal
for re-transmission the current data set; write pointer reversal for reception of the last data set again and data
toggle synchronization.
2.18.1.3 Serial Engine Interface Unit
The SIU block decodes the Address and Endpoint fields from the USB host.
2.18.1.4 Microcontroller Interface
The MCI block handles the Microcontroller interface and performs address decoding and synchronization of
control signals.
2.18.1.5 USB Transceiver
The USB transceiver, designed to interface with the physical layer of the USB, is compliant with the USB
Specification (version 1.1) for full-speed devices. It consists of two 6-ohm drivers, a receiver, and Schmitt trig-
gers for single-ended receive signals.
The transceiver also includes a voltage converter. The voltage converter can supply 3.0 - 3.6V to the trans-
mitter when the rest of the chip (CPU, USB FCU) operates at 4.15 - 5.25V. To enable the voltage converter,
set bit 4 of the USB Control Register (USBC) to a “1”. To disable the voltage converter, set bit 4 of the USBC
to a “0”. Refer to Section 5.4 “USB Transceiver” for more detailed information.
Figure 1.29: USB Function Control Unit Block Diagram
2.18.2 USB Interrupts
There are five USB interrupts in this device:
USB Function interrupt
USB Reset interrupt
USB Suspend interrupt
USB Resume interrupt
USB Start-of-Frame (SOF) interrupt.
The first four interrupts are used to control the data flow and USB power. The SOF interrupt is used to monitor
the transfer of isochronous (ISO) data. Each of the five USB interrupts is enabled by setting the corresponding
bit in the Interrupt Control Register of the Interrupt Control Unit. Because the USB Function Interrupt has mul-
tiple interrupt sources, another level of enabling is within the USB Interrupt Registers 1 & 2.
CPU
MCI
SIU
GFI
FIFOs
SIE
T
D
+
D
-
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