參數(shù)資料
型號(hào): 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): 124/144頁
文件大小: 1280K
代理商: ST72774S9T1/XXX
ST72774/ST727754/ST72734
80/144
USB INTERFACE (Cont’d)
4.6.4 Register Description
DMA ADDRESS REGISTER (DMAR)
Read / Write
Reset Value: Undefined
Bits 7:0=DA[15:8]
DMA address bits 15-8.
See the description of bits DA7-6 in the next
register (IDR).
INTERRUPT/DMA REGISTER (IDR)
Read / Write
Reset Value: xxxx 0000 (x0h)
Bits 7:6 = DA[7:6]
DMA address bits 7-6.
The software must write the start address of the
DMA memory area whose most significant bits are
given by DA15-DA6. The remaining 6 address bits
are set by hardware. See Figure 51.
Bits 5:4 = EP[1:0]
Endpoint number (read-only).
These bits identify the endpoint which required
attention.
00: Endpoint 0
01: Endpoint 1
10: Endpoint 2
When a CTR interrupt occurs (see register ISTR)
the software should read the EP bits to identify the
endpoint which has sent or received a packet.
Bits 3:0 = CNT[3:0]
Byte count (read only).
This field shows how many data bytes have been
received during the last data reception.
Note: Not valid for data transmission.
Figure 51. DMA buffers
70
DA15
DA14
DA13
DA12
DA11
DA10
DA9
DA8
70
DA7
DA6
EP1
EP0
CNT3
CNT2
CNT1
CNT0
Endpoint 0 RX
Endpoint 0 TX
Endpoint 2 RX
Endpoint 1 TX
000000
000111
001000
001111
010000
010111
011000
011111
DA15-6,000000
Endpoint 1 RX
Endpoint 2 TX
100000
100111
101000
101111
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