參數(shù)資料
型號: PXASCC
廠商: NXP Semiconductors N.V.
英文描述: CMOS 16-bit communications microcontroller(CMOS 16位通信微控制器)
中文描述: 的CMOS 16位微控制器通信的CMOS(16位通信微控制器)
文件頁數(shù): 39/42頁
文件大?。?/td> 229K
代理商: PXASCC
Philips Semiconductors
Preliminary specification
XA-SCC
CMOS 16-bit communications microcontroller
1999 Mar 29
39
CLKOUT
RAS
CASH, CASL
SU01144
t
CHSL
t
CHSH
t
CLRL
RAS and CAS terminate together. The active low portion of RAS can be programmed to last from 3 to 6 clock cycles.
The high portion of RAS after Refresh can be programmed to last from 2 to 4 clock cycles. See Chapter 3 of XA–SCC User Manual
Figure 23. REFRESH
RAS
SU01145
t
RP
NOTE: t
RP
min. is specified for each of the 5 individual RAS pins (CS_RAS[5:1]).
It is the minimum high time (thus RAS inactive) between two DRAM bus cycles on the same RAS pin.
Figure 24. RAS Precharge Time
XTALIN
SU01146
V
DD
– 0.5
0.2 V
DD
– 0.1
t
CHCL
t
CLCX
t
C
t
CLCH
t
CHCX
0.7 V
DD
0.45 V
Figure 25. External Clock Input Drive
SU01147
ClkOut
WARNING: ClkOut is specified into 40 pF max, do not overload.
t
CODH
Figure 26. ClkOut Duty Cycle
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