HD6432633 Datasheet, PDF (286/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

EXTAL
Address
RD
HWR
RAS
CAS, LCAS
Data bus
DRAM space read
Tp
Tr
Tc1
Tc2
External read
T1
T1
T2
T3
DRAM space read
Tc1
Tc1
Tc2
Idle cycle
Figure 7-37 (b) Example Idle Cycle Operation in RAS Down Mode (ICIS0=1)
7.8.2 Pin States in Idle Cycle
Table 7-8 shows pin states in an idle cycle.
Table 7-8 Pin States in Idle Cycle
Pins
Pin State
A23 to A0
Contents of next bus cycle
D15 to D0
High impedance
CSn
High*
CAS
High
AS
High
RD
High
HWR
High
LWR
High
DACKn
High
Note: * Remains low in DRAM space RAS down mode or a refresh cycle.
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