HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 141

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

16-Bit, Three-State-Access Areas: Figures 6-6 to 6-8 show the timing of bus control signals for a
16-bit, three-state-access area. In these areas, the upper address bus (D
even addresses and the lower address bus (D
can be inserted.
Read
access
Write
access
Note: n = 7 to 0
Figure 6-6 Bus Control Signal Timing for 16-Bit, Three-State-Access Area (1)
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
(Byte Access to Even Address)
T
1
7
Even external address in area n
to D
127
0
) is used to access odd addresses. Wait states
Bus cycle
Undetermined data
T
2
Valid
15
to D
Invalid
Valid
T
8
3
) is used to access