參數(shù)資料
型號： USB97CFDC-MN
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 存儲控制器/管理單元
英文描述： USB FLOPPY DISK CONTROLLER
中文描述： 1 Mbps, FLOPPY DISK DRIVE CONTROLLER, PQFP100
封裝： 12 X 12 MM, TQFP-100
文件頁數(shù)： 18/59頁
文件大?。?/td> 385K
代理商： USB97CFDC-MN
SMSC DS – USB97C201
Page 18
Rev. 03/25/2002
PRELIMINARY
Table 5 - 8051 Core SFR Register Summary
These registers are part of the 8051 design core itself.
REGISTER
BIT7
SP
DPL0
DPH0
DPL1
DPH1
DPS
0
PCON
SMOD0
TCON
TF1
TMOD
GATE
TL0
TL1
TH0
TH1
CKCON
SPC_
FNC
EXIF
IE5
MPAGE
SCON0
SM0_0
SBUF0
IE
EA
IP
1
TL2
TH2
PSW
CY
EICON
SMOD1
ACC
EIE
1
B
EIP
1
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
BIT0
ADDRESS
81h
82h
83h
84h
85h
86h
87h
88h
89h
8Ah
8Bh
8Ch
8Dh
8Eh
8Fh
0
–
TR1
C/T
0
1
TF0
M1
0
1
TR0
M0
0
GF1
IE1
GATE
0
GF0
IT1
C/T
0
STOP
IE0
M1
SEL
IDLE
IT0
M0
T2M
0
T1M
0
T0M
0
MD2
0
MD1
0
MD0
WR
S
0
0
0
IE4
IE3
IE2
1
0
0
91h
92h
98h
99h
A8h
B8h
CCh
CDh
D0h
D8h
E0h
E8h
F0h
F8h
SM1_0
SM2_0
REN_0
TB8_0
RB8_0
TI_0
RI_0
ES1
PS1
ET2
PT2
ES0
PS0
ET1
PT1
EX1
PX1
ET0
PT0
EX0
PX0
AC
1
F0
EPFI
RS1
PFI
RS0
WDTI
OV
0
F1
0
P
0
1
1
EWDI
EX5
EX4
EX3
EX2
1
1
PWDI
PX5
PX4
PX3
PX2
Notes:
Bit WRS of the SPC_FNC register controls the operation of MOVX writes the program or XDATA bus of the
8051. Setting it to 0 ( the reset state), will direct writes to the XDATA bus, either to internal or external
destinations, while setting it to 1 will allow writes to the program memory bus to occur, either internally( if the
768 SRAM is the target) or externally.
Bits MD2:0 of the CKCON SFR register (8Eh) control the cycle timing for external accesses using the nIOR and
nIOW signals. This allows slow peripheral devices to be attached. The values and corresponding strobe widths
are shown below:
MD2
MD1
MD0
NIOR/NIOW STOBE
(CLKS)
2
4
8
12
16
20
24
28
NIOR/NIOW STROBE (AT
30MHZ)
66ns
133ns
267ns
400ns
533ns
667ns
800ns
933ns
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Note:
the strobe width will vary with the actual clock divider used for the processor. For example if, 16 Mhz is used,
an MD[2:0] value of 111 will result in a 28 clock strobe or 1866ns.
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