HD6432621 Hitachi, HD6432621 Datasheet - Page 201

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

7.4.4
8-Bit 2-State Access Space: Figure 7-5 shows the bus timing for an 8-bit 2-state access space.
When an 8-bit access space is accessed, the upper half (D15 to D8) of the data bus is used.
The LWR pin is fixed high. Wait states cannot be inserted.
Basic Timing
Read
Write
Address bus
Figure 7-5 Bus Timing for 8-Bit 2-State Access Space
D15 to D8
D15 to D8
D7 to D0
D7 to D0
ø
HWR
LWR
RD
AS
T
1
Bus cycle
High
High impedance
Valid
T
2
Invalid
Valid
157