參數(shù)資料
型號(hào): ST72774S9T1
廠商: 意法半導(dǎo)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(jī)的顯示器,高達(dá)60K章檢察官辦公室,每1000內(nèi)存,模數(shù)轉(zhuǎn)換器,定時(shí)器,同步,材質(zhì)單元,脈寬調(diào)制/的BRM,的H / W DDC的
文件頁數(shù): 83/144頁
文件大?。?/td> 1280K
代理商: ST72774S9T1
ST72774/ST727754/ST72734
83/144
USB INTERFACE
(Cont’d)
ENDPOINT n REGISTER A (EPnRA)
Read / Write
Reset Value: 0000 xxxx (0xh)
These registers (
EP0RA
,
EP1RA
and
EP2RA
)
are
used for controlling data transmission. They are
also reset by the USB bus reset.
Note:
Endpoint 2 and the EP2RA register are not availa-
ble on some devices (see device feature list and
register map).
Bit 7 =
ST_OUT
Status out.
This bit is set by software to indicate that a status
out packet is expected: in this case, all nonzero
OUT data transfers on the endpoint are STALLed
instead of being ACKed. When ST_OUT is reset,
OUT transactions can have any number of bytes,
as needed.
Bit 6 =
DTOG_TX
Data Toggle, for transmission
transfers.
It contains the required value of the toggle bit
(0=DATA0, 1=DATA1) for the next transmitted
data packet. This bit is set by hardware at the
reception of a SETUP PID. DTOG_TX toggles only
when the transmitter has received the ACK signal
from the USB host. DTOG_TX and also
DTOG_RX (see EPnRB) are normally updated by
hardware, at the receipt of a relevant PID. They
can be also written by software.
Bits 5:4 =
STAT_TX[1:0]
Status bits, for
transmission transfers.
These bits contain the information about the
endpoint status, which are listed below:
These bits are written by software. Hardware sets
the STAT_TX bits to NAK when a correct transfer
has occurred (CTR=1) related to a IN or SETUP
transaction addressed to this endpoint; this allows
the software to prepare the next set of data to be
transmitted.
Bits 3:0 =
TBC[3:0]
Transmit byte count for
Endpoint n.
Before transmission, after filling the transmit
buffer, software must write in the TBC field the
transmit packet size expressed in bytes (in the
range 0-8).
7
0
ST_
OUT
DTOG
_TX
STAT
_TX1
STAT
_TX0
TBC
3
TBC
2
TBC
1
TBC
0
STAT_TX1 STAT_TX0 Meaning
0
0
DISABLED:
transmission
transfers cannot be execut-
ed.
0
1
STALL
: the endpoint is
stalled and all transmission
requests result in a STALL
handshake.
1
0
NAK
: the endpoint is naked
and all transmission re-
quests result in a NAK hand-
shake.
1
1
VALID
: this endpoint is ena-
bled for transmission.
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