HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 158
HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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6.4 Usage Notes
6.4.1 Connection to Dynamic RAM and Pseudo-Static RAM
A different bus control signal timing applies when dynamic RAM or pseudo-static RAM is
connected to area 3. For details see section 7, Refresh Controller.
6.4.2 Register Write Timing
ABWCR, ASTCR, and WCER Write Timing: Data written to ABWCR, ASTCR, or WCER
takes effect starting from the next bus cycle. Figure 6-20 shows the timing when an instruction
fetched from area 0 changes area 0 from three-state access to two-state access.
ø
Address
bus
3-state access to area 0
T
1
T
Figure 6-20 ASTCR Write Timing
2
T
3
144
T
1
ASTCR address
T
2
T
3
2-state access
to area 0
T
1
T
2
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