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參數(shù)資料
| 型號： | M30240S4 |
| 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(jī) |
| 文件頁數(shù)： | 49/142頁 |
| 文件大小： | 1637K |
| 代理商： | M30240S4 |
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1-49
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
2.18.3.3 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.
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 (001F
16
) and USB con-
trol (000C
16
) must use byte access. Work access is prohibited for USB internal registers (0300
16
-
033C
16
).
The contents of all USB Special Functions Registers, including USB Attach/Detach and USB Control,
are preserved on a software reset.
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, caus-
ing 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 re-
sistor 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
USBAD
Address
001F16
When reset
0016
Bit name
Bit symbol
b7 b6 b5 b4 b3 b2 b1 b0
0 0 0 0 0 0
0 : Normal mode for Port 8_3
1 : Forces Port 8_3 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, P8_3 causing the host to detect a detach
1 : Drives P8_3 with voltage on EXTCAP, causing the host
to detect an attach
W
R
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| M30240S4-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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| M30240S5-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240S6 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240S6-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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