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參數(shù)資料
| 型號(hào)： | M37640E8FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 54/96頁 |
| 文件大小： | 1477K |
| 代理商： | M37640E8FP |
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54
Ver 1.4
MITSUBISHI MICROCOMPUTERS
7640 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
1.21.4 USB Special Function Registers
The MCU controls USB operation through the use of
special function registers (SFR). This section de-
scribes in detail each USB related SFR. Certain USB
SFRs are endpoint-indexed: the Control & Status
Registers (IN CSR and OUT CSR), the Maximum
Packet Size Registers (IN MAXP and OUT MAXP),
and the Write Count Registers (OUT WRT CNT). To
access each endpoint-indexed SFR, the target end-
point number should be written to the Endpoint Index
Register first. The lower 3 bits (EPINDX2:0) of the
Endpoint Index Register are used for endpoint selec-
tion.
Note: Each endpoint’s FIFO Register is NOT end-
point-indexed.
Some USB special function registers have a mix of
read/write, read only, and write-only register bits. Ad-
ditionally, the bits may be configured to allow the user
to write only a “0” or a “1” to individual bits. When ac-
cessing these registers, writing a “0” to a register that
can only be set to a “1” by the CPU will have no affect
on that register bit. Each figure and description of the
special function registers will detail this operation.
The
USB Control Register (USBC)
, shown in Figure
1.52, is used to control the USB FCU. A USB reset
signaling does not reset this register. After the USB is
enabled (USBC7 set to “1”), a minimum delay of 250
ns (three 12Mhz clock periods) is needed before per-
forming any other USB register read/write operations.
The
USB Function Address Register (USBA),
shown in Figure 1.53, maintains the 7-bit USB ad-
dress assigned by the host. The USB FCU uses this
register value to decode USB token packet ad-
dresses. At reset, when the device is not yet
configured, the value is 00
16
.
Fig. 1.52. USB Control Register (USBC)
Fig. 1.53. Function Address Register (USBA)
Reserved
FUNAD5
FUNAD3
FUNAD1
MSB
7
LSB
0
Address: 0050
16
Access: R/W
Reset: 00
16
FUNAD6
FUNAD0
FUNAD4
FUNAD2
FUNAD6:0
7-bit programmable Function Address (bit 6-0)
Bit 7
Reserved (Read/Write “0”)
Bit 0
USBC1
Reserved (Read/Write “0”)
USB Default State Selection Bit (bit 1)
0: In default state after power/reset
1: In default state after USB reset signaling received
Bit 2
Reserved (Read/Write “0”)
USBC3
Transceiver Voltage Converter High/Low Current Mode Select Bit (bit 3)
0: High current mode
1: Low current mode
USB Transceiver Voltage Converter Bit (bit 4)
0: USB transceiver voltage converter disabled
1: USB transceiver vlotage converter enabled
USB Clock Enabled Bit (bit 5)
0: 48 MHz clock to the USB block is disabled
1: 48 Mhz clock to the USB block is enabled
USB SOF Port Select Bit (bit 6)
0: USB SOF output is disabled P7
0
is used to GPIO pin
1: USB SOF output is enabled
USB Enable Bit (bit 7)
0: USB block is disabled, all USB internal registers are held at their default values
1: USB block is enabled
USBC4
USBC5
USBC6
USBC7
USBC7
USBC5
USBC4
Reserved
USBC1
MSB
7
LSB
0
Address: 0013
16
Access: R/W
Reset: 00
16
USBC6
USBC3
Reserved
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