HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 139

• Manufacturer Part Number: HD6433045
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

6.3.4 Bus Control Signal Timing
8-Bit, Three-State-Access Areas: Figure 6-4 shows the timing of bus control signals for an 8-bit,
three-state-access area. The upper address bus (D
pin is always high. Wait states can be inserted.
Read
access
Write
access
Note: n = 7 to 0
Figure 6-4 Bus Control Signal Timing for 8-Bit, Three-State-Access Area
ø
Address bus
CS
AS
RD
D
D to D
HWR
LWR
D
D to D
15
15
7
7
n
to D
to D
0
0
8
8
High
T
1
125
External address in area n
15
to D
Bus cycle
Undetermined data
8
) is used to access these areas. The LWR
T
2
Valid
Invalid
Valid
T
3