M30240ECFP MITSUBISHI [Mitsubishi Electric Semiconductor], M30240ECFP Datasheet - Page 45

• Manufacturer Part Number: M30240ECFP
• Description: M30240 Group Specification
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Preliminary Specifications REV. E
Specifications in this manual are tentative and subject to change
Universal Serial Bus
Figure 1.29: USB Function Control Unit Block Diagram
2.18.2 USB Interrupts
2.18.1.2 Generic Function Interface
2.18.1.3 Serial Engine Interface Unit
2.18.1.4 Microcontroller Interface
2.18.1.5 USB Transceiver
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.
The SIU block decodes the Address and Endpoint fields from the USB host.
The MCI block handles the Microcontroller interface and performs address decoding and synchronization of
control signals.
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.
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
1-45
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
FIFOs
SIU
GFI
SIE
Mitsubishi microcomputers
M30240 Group
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