HD6432621 Hitachi, HD6432621 Datasheet - Page 202

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

8-Bit 3-State Access Space: Figure 7-6 shows the bus timing for an 8-bit 3-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 can be inserted.
158
Read
Write
Address bus
D15 to D8
D15 to D8
D7 to D0
D7 to D0
ø
HWR
LWR
RD
AS
Figure 7-6 Bus Timing for 8-Bit 3-State Access Space
T
1
High impedance
Bus cycle
High
T
2
Valid
T
3
Invalid
Valid