HD6412350 Hitachi, HD6412350 Datasheet - Page 186

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

6.5.9
When DRAM with a 16 configuration is connected, the 2-CAS system can be used for the
control signals required for byte access.
When the CW2 bit is cleared to 0 in MCR, the 2-CAS system is selected. Figure 6-18 shows the
control timing in the 2-CAS system, and figure 6-19 shows an example 2-CAS system DRAM
connection.
When only DRAM with a 8 configuration is connected, set the CW2 bit to 1 in MCR.
166
Byte control
Note: n = 2 to 5
Byte Access Control
Figure 6-18 2-CAS System Control Timing (Upper Byte Write Access)
CSn (RAS)
HWR (WE)
A
23
LCAS
to A
CAS
ø
0
T
p
Row
T
r
T
c1
Column
T
c2