参数资料
型号: ST72SCR1x4T1
厂商: 意法半导体
英文描述: 8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER
中文描述: 8位低功耗,全速USB微控制器与16K的闪存,768内存,智能卡的I /楼,计时器
文件页数: 51/102页
文件大小: 1413K
代理商: ST72SCR1X4T1
ST7SCR
51/102
USB INTERFACE
(Cont’d)
ENDPOINT
(EP2RXR)
Read/Write
Reset value: 0000 0000 (00h)
2
RECEPTION
REGISTER
This register is used for controlling Endpoint 2 re-
ception. Bits 2:0 are also reset by a USB reset, ei-
ther received from the USB or forced through the
FRES bit in the USBCTLR register.
Bits [7:4] = Reserved, forced by hardware to 0.
Bit 3 =
CTR_RX
Reception Correct Transfer
.
This bit is set by hardware when a correct transfer
operation is performed in reception. This bit must
be cleared after that the corresponding interrupt
has been serviced.
Bit 2 =
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.
The receiver toggles DTOG_RX only if it receives
acorrect data packet and the packet’s data PID
matches the receiver sequence bit.
Bits [1:0] =
STAT_RX [1:0]
Status bits, for recep-
tion transfers
.
These bits contain the information about the end-
point status, which is listed below:
Table 18. Reception Status Encoding
These bits are written by software, but hardware
sets the STAT_RX bits to NAK when a correct
transfer has occurred (CTR=1) addressed to this
endpoint, so the software has the time to examine
the received data before acknowledging a new
transaction.
7
0
0
0
0
0
CTR_R
X
DTOG
_RX
STAT_
RX1
STAT_
RX0
STAT_RX1 STAT_RX0
Meaning
0
0
DISABLED:
reception trans-
fers cannot be executed.
STALL:
the endpoint is stalled
and all reception requests re-
sult in a STALL handshake.
NAK
: the endpoint is naked
and all reception requests re-
sult in a NAK handshake.
VALID
: this endpoint is ena-
bled for reception.
0
1
1
0
1
1
1
相关PDF资料
PDF描述
ST72FSCR1x4T1 8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER
ST72PSCR1x4T1 8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER
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