7733 Datasheet, PDF (704/940 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

CONNECTING EXTERNAL DEVICES
12.4 Hold function
<<When “L” level is input to pin HOLD while bus is in use (3)>>
q State when “L” level is input to pin HOLD
External data bus
Data length
External data bus width
In use
8
8, 16
16
16
(When accessed starting from even address)
Software wait
Wait 0
Sampling timing
Clock 1
ALE
g
CS0 to CS4
External address bus/
External data bus
External address bus
BHE
HOLD
HLDA
Address A
Data
Bus is not in use.
Bus is in use.
Floating
Address A Œ
Floating
Floating
Address B
1! 1
1!1
Hold state
Bus is in use.
Œ When “L” level which is input to pin HOLD is accepted, the address which was output
immediately before is output again, instead of a new address.
g RDE, WEL, WEH
Fig. 12.4.5 Timing when hold state is accepted and terminated (4)
12–28
7735 Group User’s Manual