HD6412350 Hitachi, HD6412350 Datasheet - Page 203

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

6.8.2
Table 6-8 shows pin states in an idle cycle.
Table 6-8
Pins
A
D
CSn
CAS
AS
RD
HWR
LWR
DACKn
Note: * Remains low in DRAM space RAS down mode or a refresh cycle.
CAS, LCAS
23
15
Data bus
Address
to A
to D
EXTAL
Figure 6-35 (b) Example of Idle Cycle Operation in RAS Down Mode (ICIS0 = 1)
HWR
RAS
0
0
RD
Pin States in Idle Cycle
Pin States in Idle Cycle
T
p
Pin State
Contents of next bus cycle
High impedance
High*
High
High
High
High
High
High
DRAM space read
T
r
T
c1
T
c2
T
1
External read
T
1
T
2
T
3
Idle cycle
DRAM space write
T
c1
T
c1
T
c2
183