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參數(shù)資料
| 型號： | ST72774S9T1 |
| 廠商： | 意法半導體 |
| 元件分類： | 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單片機的顯示器，高達60K章檢察官辦公室，每1000內存，模數(shù)轉換器，定時器，同步，材質單元，脈寬調制/的BRM，的H / W DDC的 |
| 文件頁數(shù)： | 81/144頁 |
| 文件大?。?/td> | 1280K |
| 代理商： | ST72774S9T1 |
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ST72774/ST727754/ST72734
81/144
USB INTERFACE
(Cont’d)
PID REGISTER (PIDR)
Read only
Reset Value: xx00 0000 (x0h)
Bits 7:6 =
TP3-TP2
Token PID bits 3 & 2
.
USB token PIDs are encoded in four bits.
TP3-TP2
correspond to the variable token PID bits 3 & 2.
Note:
PID bits 1 & 0 have a fixed value of 01.
When a CTR interrupt occurs (see register ISTR)
the software should read the TP3 and TP2 bits to
retrieve the PID name of the token received.
The USB standard defines TP bits as:
Bit 5:0 Reserved. Forced by hardware to 0.
INTERRUPT STATUS REGISTER (ISTR)
Read / Write
Reset Value: 0000 0000 (00h)
When an interrupt occurs these bits are set by
hardware. Software must read them to determine
the interrupt type and clear them after servicing.
Note:
These bits cannot be set by software.
Bit 7 = Reserved. Forced by hardware to 0.
Bit 6 =
DOVR
DMA over/underrun
.
This bit is set by hardware if the ST7 processor
can’t answer a DMA request in time.
0: No over/underrun detected
1: Over/underrun detected
Bit 5 =
CTR
Correct Transfer.
This bit is set by
hardware when a correct transfer operation is
performed. The type of transfer can be determined
by looking at bits TP3-TP2 in register PIDR. The
Endpoint on which the transfer was made is
identified by bits EP1-EP0 in register IDR.
0: No Correct Transfer detected
1: Correct Transfer detected
Note:
A transfer where the device sent a NAK or STALL
handshake is considered not correct (the host only
sends ACK handshakes). A transfer is considered
correct if there are no errors in the PID and CRC
fields, if the DATA0/DATA1 PID is sent as expect-
ed, if there were no data overruns, bit stuffing or
framing errors.
Bit 4 =
ERR
Error.
This bit is set by hardware whenever one of the
errors listed below has occurred:
0: No error detected
1: Timeout, CRC, bit stuffing or nonstandard
framing error detected
Bit 3 =
IOVR
Interrupt overrun.
This bit is set when hardware tries to set ERR,
ESUSP or SOF before they have been cleared by
software.
0: No overrun detected
1: Overrun detected
Bit 2 =
ESUSP
End suspend mode
.
This bit is set by hardware when, during suspend
mode, activity is detected that wakes the USB
interface up from suspend mode.
This interrupt is serviced by a specific vector.
0: No End Suspend detected
1: End Suspend detected
Bit 1 =
RESET
USB reset.
This bit is set by hardware when the USB reset
sequence is detected on the bus.
0: No USB reset signal detected
1: USB reset signal detected
Note:
The DADDR, EP0RA, EP0RB, EP1RA, EP1RB,
EP2RA and EP2RB registers are reset by a USB
reset.
7
0
TP3
TP2
0
0
0
0
0
0
TP3
TP2
PID Name
0
0
OUT
1
0
IN
1
1
SETUP
7
0
0
DOVR
CTR
ERR
IOVR
ESUSP
RESET
SOF
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