参数资料
型号: ST72F60E1M1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO24
封装: 0.300 INCH, LEAD FREE, PLASTIC, SOP-24
文件页数: 136/139页
文件大小: 1993K
代理商: ST72F60E1M1
USB interface (USB)
ST7260xx
96/139
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).
Caution:
Any value outside the range 0-8 willinduce undesired effects (such as continuous data
transmission).
14.4.9
Endpoint n register B (EPnRB)
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 available 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.
Bits 5:4 = STAT_RX [1:0] Status bits, for reception transfers.
These bits contain the information about the endpoint status, which are listed below:
Table 44.
STAT_TX bits
STAT_TX1
STAT_TX0
Meaning
00
DISABLED: transmission transfers cannot be
executed.
01
STALL: the endpoint is stalled and all transmission
requests result in a STALL handshake.
10
NAK: the endpoint is naked and all transmission
requests result in a NAK handshake.
11
VALID: this endpoint is enabled for transmission.
EPnRB
Reset value:
0000 xxxx (0xh)
76
543
21
0
CTRL
DTOG
_RX
STAT
_RX1
STAT
_RX0
EA3
EA2
EA1
EA0
R/W
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