參數(shù)資料
型號: Q67126-C2042
廠商: SIEMENS AG
元件分類: 8位微控制器
英文描述: 8-Bit CMOS Microcontroller
中文描述: 8位CMOS微控制器
文件頁數(shù): 30/65頁
文件大?。?/td> 427K
代理商: Q67126-C2042
Semiconductor Group
30
1997-10-01
C540U
C541U
USB Registers
Two different kinds of registers are implemented in the USB module. The global registers (GEPIR,
EPSEL, ADROFF, USBVAL) describe the basic functionality of the complete USB module and can
be accessed via unique SFR addresses. For reduction of the number of SFR addresses which are
needed to control the USB module inside the C540U/C541U, device registers and endpoint
registers are mapped into an SFR address block of seven SFR addresses (C1H to C7H). The
endpoint specific functionality of the USB module is controlled via the device registers DCR,
DPWDR, DIER, DIRR and the frame number registers. An endpoint register set is available for each
endpoint (n=0..4) and describes the functionality of the selected endpoint.
Figure 14
explains the
structure of the USB module registers.
Figure 14
Register Structure of the USB Module
0
0
0 .4 .3 .2 .1 .0
0
.0
.3
0 .5 .4
.2 .1
.7
.7
.0
.0
0
.3
0
0
.6 .5
0
.4
.2
.2
.1
.1
ADROFF (D4 )
EPSEL (D2 )
USBVAL (D3 )
GEPIR (D6 )
Decoder
Global Registers
C1
H
C2
H
C3
H
C4
H
C5
H
C6
H
C7
H
FNRH
DCR
DPWDR
DIER
DIRR
reserved
FNRL
Device
Registers
Endpoint 0
Registers
EPIR0
reserved
EPLEN0
EPBA0
EPBS0
C6
C7
H
H
C3
C5
C4
H
H
H
C2
C1
H
H
EPIE0
EPBC0
Endpoint 2
Registers
Endpoint 1
Registers
C6
C7
H
H
C3
C5
C4
H
H
H
C2
C1
H
H
C6
C7
H
H
H
C5
H
C4
C3
H
C1
C2
H
H
Endpoint 3
Registers
C6
C7
H
H
C5
C4
C3
C1
C2
H
H
H
H
H
Endpoint 4
Registers
C6
C7
H
H
C3
C4
C5
H
H
H
C2
C1
H
H
reserved
EPLEN1
EPBA1
EPIR1
EPIE1
EPBS1
EPBC1
reserved
EPLEN2
EPBA2
EPIR2
EPIE2
EPBS2
EPBC2
reserved
EPLEN3
EPBA3
EPIR3
EPIE3
EPBS3
EPBC3
reserved
EPLEN4
EPBA4
EPIR4
EPIE4
EPBS4
EPBC4
MCD03312
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