HD6432670 Hitachi, HD6432670 Datasheet - Page 295

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

6.11.3
Figure 6.84 shows the timing for transition to the bus released state.
Address bus
Data bus
,
[1] Low level of
[2] Bus control signal returns to be high at end of external space access cycle.
[3]
[4]
[5] High level of
[6]
[7] When there is external access or refresh request of internal bus master during external
[8] Normally
ø
Transition Timing
At least one state from sampling of
bus release while BREQOE bit is set to 1,
External space
access cycle
signal is driven low, releasing bus to external bus master.
signal is driven high, ending external bus release cycle.
signal state is also sampled in external bus released state.
Figure 6.84 Bus Released State Transition Timing
T
signal goes high 1.5 states after rising edge of
1
signal is sampled at rise of ø.
signal is sampled.
[1]
T
2
[2]
signal.
[3]
signal goes low.
[4]
[5]
External bus released state
signal.
High-Z
High-Z
High-Z
High-Z
High-Z
Rev. 2.0, 04/02, page 249 of 906
[6]
[7]
[8]
CPU
cycle