CHAPTER 4 BUS CONTROL FUNCTION
User’s Manual U13850EJ4V0UM
121
Figure 4-13. Bus Hold Timing
CLKOUT (output)
R/W (output)
DSTB, RD,
WRH, WRL (output)
UBEN, LBEN (output)
WAIT (input)
HLDRQ (input)
T2
T3
TH
TH
TH
TH
TI
T1
HLDAK (output)
A16 to A21 (output)
A1 to A15 (output)
AD0 to AD15
(input/output)
Address
Address
Address
Data
Address
ASTB (output)
Undefined
Address
Note 1
Note 2
Notes 1.
If HLDRQ signal is inactive (high-level) at this sampling timing, bus hold state is not entered.
2.
If transferred to bus hold status after a write cycle, high-level may be output momentarily from the
R/W pin immediately before HLDAK signal changes from high-level to low-level.
Remarks 1.
{
indicates the sampling timing when the number of programmable waits is set to 0.
2.
The broken line indicates the high-impedance state.
Содержание MPD703030A
Страница 2: ...User s Manual U13850EJ4V0UM 2 MEMO ...
Страница 514: ...User s Manual U13850EJ4V0UM 514 MEMO ...