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参数资料
| 型号： | ST72T734J6B1 |
| 厂商： | 意法半导体 |
| 元件分类： | ADC |
| 英文描述： | 8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C |
| 中文描述： | 8位USB单片机的显示器，高达60K章检察官办公室，每1000内存，模数转换器，定时器，同步，材质单元，脉宽调制/的BRM，的H / W DDC的 |
| 文件页数： | 126/144页 |
| 文件大小： | 1280K |
| 代理商： | ST72T734J6B1 |
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ST72774/ST727754/ST72734
82/144
USB INTERFACE (Cont’d)
Bit 0 = SOF
Start of frame.
This bit is set by hardware when a low-speed SOF
indication (keep-alive strobe) is seen on the USB
bus.
0: No SOF signal detected
1: SOF signal detected
Note: To avoid spurious clearing of some bits, it is recom-
mended to clear them using a load instruction
where all bits which must not be altered are set, and
all bits to be cleared are reset. Avoid read-modify-
write instructions like AND , XOR..
INTERRUPT MASK REGISTER (IMR)
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7 = Reserved. Forced by hardware to 0.
Bits 6:0 = These bits are mask bits for all interrupt
condition bits included in the ISTR. Whenever one
of the IMR bits is set, if the corresponding ISTR bit
is set, and the I bit in the CC register is cleared, an
interrupt request is generated. For an explanation
of each bit, please refer to the corresponding bit
description in ISTR.
CONTROL REGISTER (CTLR)
Read / Write
Reset Value: 0000 0110 (06h)
Bits 7:4 = Reserved. Forced by hardware to 0.
Bit 3 = RESUME
Resume.
This bit is set by software to wake-up the Host
when the ST7 is in suspend mode.
0: Resume signal not forced
1: Resume signal forced on the USB bus.
Software should clear this bit after the appropriate
delay.
Bit 2 = PDWN
Power down.
This bit is set by software to turn off the 3.3V on-
chip voltage regulator that supplies the external
pull-up resistor and the transceiver.
0: Voltage regulator on
1: Voltage regulator off
Note: After turning on the voltage regulator, software
should allow at least 3 s for stabilisation of the
power supply before using the USB interface.
Bit 1 = SUSP
Suspend mode.
This bit is set by software to enter Suspend mode.
0: Suspend mode inactive
1: Suspend mode active
When the hardware detects USB activity, it resets
this bit (it can also be reset by software).
Bit 0 = FRES
Force reset.
This bit is set by software to force a reset of the
USB interface, just as if a RESET sequence came
from the USB.
0: Reset not forced
1: USB interface reset forced.
The USB is held in RESET state until software
clears this bit, at which point a “USB-RESET”
interrupt will be generated if enabled.
DEVICE ADDRESS REGISTER (DADDR)
Read / Write
Reset Value: 0000 0000 (00h)
Bit 7 = Reserved. Forced by hardware to 0.
Bits 6:0 = ADD[6:0]
Device address, 7 bits.
Software must write into this register the address
sent by the host during enumeration.
Note: This register is also reset when a USB reset is re-
ceived from the USB bus or forced through bit
FRES in the CTLR register.
70
0
DOV
RM
CTR
M
ERR
M
IOVR
M
ESU
SPM
RES
ETM
SOF
M
70
0
RESUME
PDWN
SUSP
FRES
70
0
ADD6
ADD5
ADD4
ADD3
ADD2
ADD1
ADD0
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