參數(shù)資料
型號： M30240M6-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80
封裝： 0.80 MM PITCH, PLASTIC, QFP-80
文件頁數(shù)： 81/139頁
文件大小： 1453K
代理商： M30240M6-XXXFP
46
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Specifications REV. G
Specifications in this manual are tentative and subject to change
Universal Serial Bus
1.2.18.3.3 Interrupt Endpoints
Any endpoint can be used for interrupt transfers. For normal interrupt transfers, the interrupt transactions be-
have the same as bulk transactions, i.e., no special setting is required. The IN endpoints may also be used to
communicate rate feedback information for certain types of isochronous functions. This is done by setting the
INTPT bit in the IN CSR register of the corresponding endpoint.
The following outlines the operation sequence for an IN endpoint used to communicate rate feedback infor-
mation:
1. Set MAXP > 1/2 of the endpoint’s FIFO size;
2. Set INTPT bit of the IN CSR;
3. Flush the old data in the FIFO;
4. Load interrupt status information and set IN_PKT_RDY bit in the IN CSR;
5. Repeat steps 3 & 4 for all subsequent interrupt status updates.
1.2.18.4 USB Special Function Registers
The MCU controls USB operation through the use of special function registers (SFR). This section de-
scribes each USB related SFR. Some USB special function registers have a mix of read/write, read
only, and write only register bits. Additionally, the bits may be configured to allow the user to write only
a “0” or a “1” to individual bits.
When accessing these registers, writing a “0” to a register that can only be set to a “1” by the CPU
has no effect on that register bit.
Writing a “1” to a register that can only be set to a “0” by the CPU has not effect on that register bit.
Each figure and description of the special function registers details this operation.
All USB Special Function Registers, with the exception of USB Attach/Detach (001F16) and USB con-
trol (000C16) must use byte access. Word access is prohibited for USB internal registers (030016 -
033C16).
The contents of all USB Special Functions Registers, including USB Attach/Detach and USB Control,
are preserved on a software reset.
1.2.18.4.1 USB Attach/Detach Register
The USB Attach / Detach Register is shown in Figure 1.30. The register is used to attach and detach the USB
function from a USB host without physically disconnecting the USB cable. This functionality is enabled by set-
ting P83_Second to a “1”. Doing this forces P83 to operate as a pull-up for D+ (through an external 1.5k ohm
resistor). The port driver is tri-stated and a “1” is always read from the port bit in this mode. When the ATTACH/
DETACH bit is a “1” (and P83_Second is a “1”), P83 is driven with the voltage on EXTCAP, causing D+ to be
pulled up and the host to detect an attach. When the ATTACH/DETACH bit is a “0” (and P83_Second is a “1”),
P83 is tri-stated, causing D+ to be pulled down (through the cable and 15k ohm resistor on the host/hub side)
and a detach to be registered by the host. A 1.5k ohm pull-up resistor must be connected externally from P83
to D+ when this functionality is used. When it is not used, the 1.5k ohm resistor should be placed between
EXTCAP and D+.
Figure 1.30: USB Attach/Detach Register
USB Attach/Detach Register
Symbol
Address
When reset
USBAD
001F16
0016
Bit name
Bit symbol
b7 b6 b5 b4 b3 b2 b1 b0
0 : Normal mode for Port
1 : Forces Port
to operate as pull up for D+.
P83_2nd
Function
Reserved
Must always be set to "0"
Port 83-Second
Attach/
Detach
Attach/Detach
0 : Tri-states,
causing the host to detect a detach
1 : Drives
with voltage on EXTCAP, causing the host
to detect an attach
W
R
0 0 0 0 0 0
P83
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