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參數(shù)資料
| 型號： | ST72774S9T1/XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁數(shù)： | 127/144頁 |
| 文件大?。?/td> | 1280K |
| 代理商： | ST72774S9T1/XXX |
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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).
70
ST_
OUT
DTOG
_TX
STAT
_TX1
STAT
_TX0
TBC
3
TBC
2
TBC
1
TBC
0
STAT_TX1 STAT_TX0 Meaning
00
DISABLED: transmission
transfers cannot be execut-
ed.
01
STALL: the endpoint is
stalled and all transmission
requests result in a STALL
handshake.
10
NAK: the endpoint is naked
and all transmission re-
quests result in a NAK hand-
shake.
11
VALID: this endpoint is ena-
bled for transmission.
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