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Section 6 Usage Notes
6 . 1
CPU Clock and Q2-CLK0
1. When the SuperH and Q2 are operated asynchronously, input a clock that satisfies the
following conditions to the CLK0 pin.
High level interval of
RD
input to Q2, and
WE0
and WE1 > Q2
WE
or
RD
setup time + hold
time + Q2 operating clock cycle (see figure 6.2).
2. When the SuperH and Q2 are operated using the same cycle, it is assumed that a clock with the
same frequency and same phase as the SuperH clock is used as the Q2 operating clock.
Therefore, Q2 multiplication should be turned off, and the clock output from the CK pin
should be input directly to CLK0 (see figure 6-1). This operation is possible only with an SH-
1 or SH-2 CPU.
The
RD
and
WE
high-level setup time and hold time specifications must still be observed
when synchronous clock operation is used (figure 6-2).
PLL:
×
1
×
2
×
3
Selection
SH-1 or SH-2
XTAL
Multiplication off
Q2
CK
CLK0
Figure 6-1 Example of Connection for Synchronous Operation
Содержание HD64411 Q2
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Страница 108: ...101 Example 0 0 Work coordinates Rendering coordinates XC YC ...
Страница 110: ...103 Example Old XC YC Old XC XC old YC YC 0 0 Work coordinates Rendering coordinates XC YC ...
Страница 112: ...105 Example 0 0 Work coordinates Rendering coordinates XO1 YO1 XO1 DX2 YO1 DY2 XO1 DX1 YO1 DY1 LINE ...
Страница 116: ...109 Example 0 0 Work coordinates Rendering coordinates XMIN YMIN XMAX YMAX ...
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Страница 213: ...206 Figure 7 20 TV Sync Mode Display Timing When DOT 0 or DOT 1 and EXHSYNC cycle is even multiple of CLK1 cycle ...