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参数资料
| 型号： | ST72774S9T1/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | TQFP-44 |
| 文件页数： | 128/144页 |
| 文件大小： | 1280K |
| 代理商： | ST72774S9T1/XXX |
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ST72774/ST727754/ST72734
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USB INTERFACE (Cont’d)
ENDPOINT n REGISTER B (EPnRB)
Read / Write
Reset Value: 0000 xxxx (0xh)
These registers (EP1RB and EP2RB) are used for
controlling data reception on Endpoints 1 and 2.
They are also reset by the USB bus reset.
Note: Endpoint 2 and the EP2RB register are not availa-
ble on some devices (see device feature list and
register map).
Bit 7 = CTRL
Control.
This bit should be 0.
Note: If this bit is 1, the Endpoint is a control endpoint.
(Endpoint 0 is always a control Endpoint, but it is
possible to have more than one control Endpoint).
Bit 6 = DTOG_RX
Data toggle, for reception
transfers.
It contains the expected value of the toggle bit
(0=DATA0, 1=DATA1) for the next data packet.
This bit is cleared by hardware in the first stage
(Setup Stage) of a control transfer (SETUP
transactions start always with DATA0 PID). The
receiver toggles DTOG_RX only if it receives a
correct data packet and the packet’s data PID
matches the receiver sequence bit.
Bit 5:4 = STAT_RX [1:0]
Status bits, for reception
transfers.
These bits contain the information about the
endpoint status, which are listed in the following
table:
These bits are written by software. Hardware sets
the STAT_RX bits to NAK when a correct transfer
has occurred (CTR=1) related to an OUT or
SETUP transaction addressed to this endpoint, so
the software has the time to elaborate the received
data before acknowledging a new transaction.
Bits 3:0 = EA[3:0]
Endpoint address.
Software must write in this field the 4-bit address
used to identify the transactions directed to this
endpoint. Usually EP1RB contains “0001” and
EP2RB contains “0010”.
ENDPOINT 0 REGISTER B (EP0RB)
Read / Write
Reset Value: 1000 0000 (80h)
This register is used for controlling data reception
on Endpoint 0. It is also reset by the USB bus
reset.
Bit 7 = Forced by hardware to 1.
Bit 6:4 = Refer to the EPnRB register for a
description of these bits.
Bit 3:0 = Forced by hardware to 0.
70
CTRL
DTOG
_RX
STAT
_RX1
STAT
_RX0
EA3
EA2
EA1
EA0
STAT_RX1 STAT_RX0 Meaning
00
DISABLED: reception
transfers
cannot
be
executed.
01
STALL: the endpoint is
stalled and all reception
requests result in a STALL
handshake.
10
NAK: the endpoint is na-
ked and all reception re-
quests result in a NAK
handshake.
11
VALID: this endpoint is
enabled for reception.
70
1
DTOG
RX
STAT
RX1
STAT
RX0
00
0
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