参数资料
型号: M37641F8FP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP80
封装: 14 X 20 MM, 0.80 MM, PLASTIC, QFP-80
文件页数: 96/140页
文件大小: 1694K
代理商: M37641F8FP
7641 Group
Rev.4.00
Aug 28, 2006
page 57 of 135
REJ03B0191-0400
[USB endpoint x (x = 0 to 4) OUT Write Count Registers (Low
and High)] WRT_CNTRL, WRT_CNTH
These registers contain the number of bytes in the endpoint x
OUT FIFO. These are read-only registers. These two registers
must be read after the USB FCU has received a packet of data
from the host. When reading these registers, the lower byte must
be read first, then the higher byte.
When the OUT FIF0 is in double buffer mode, the CPU first reads
the received number of bytes of the former data packet. The next
CPU read can obtain that of the new data packet.
Fig. 51 Structure of USB endpoint x (x = 0 to 4) OUT write count registers
Low-order 8 bits of the number of bytes in endpoint x OUT FIFO
USB endpoint x OUT write count register Low (address 005D16)
WRT_CNTL
b0
b7
High-order 2 bits of the number of bytes in endpoint x OUT FIFO
Not used (“0” at read)
USB endpoint x OUT write count register High (address 005E16)
WRT_CNTH
b0
b7
[USB Endpoint x (x = 0 to 4) FIFO Register] USBFIFOx
These registers are the USB IN (transmit) and OUT (receive) FIFO
data registers. Write data to the corresponding register, and read
data from the corresponding register.
When the maximum packet size is equal to or less than half the
FIFO size, these registers function in double buffer mode and can
hold two packets of data. When the IN_PKT_RDY bit is “0” and
the TX_NOT_EMPTY bit is “1”, these bits indicate that one packet
of data is stored in the IN FIFO. When the OUT FIFO is in double
buffer mode, the OUT_PKT_RDY flag remains as “1” after the first
packet of data is read out (it actually goes to “0” and returns to “1”
after one
φ cycle).
Endpoint x IN/OUT FIFO
USB endpoint x FIFO register
(addresses 006016, 006116, 006216, 006316, 006416,)
USBFIFOx
b0
b7
Fig. 52 Structure of USB endpoint x (x = 0 to 4) FIFO register
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