HD6432621 Hitachi, HD6432621 Datasheet - Page 206

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

16-Bit 3-State Access Space: Figures 7-10 to 7-12 show bus timings for a 16-bit 3-state access
space. When a 16-bit access space is accessed , the upper half (D15 to D8) of the data bus is used
for the even address, and the lower half (D7 to D0) for the odd address.
Wait states can be inserted.
162
Figure 7-10 Bus Timing for 16-Bit 3-State Access Space (1) (Even Address Byte Access)
Read
Write
Address bus
D15 to D8
D15 to D8
D7 to D0
D7 to D0
ø
HWR
LWR
RD
AS
T
1
High impedance
High
Bus cycle
T
2
Valid
T
3
Invalid
Valid