CHAPTER 4 BUS CONTROL FUNCTION
User’s Manual U13850EJ4V0UM
115
4.8 Bus Timing
The V850/SB1 and V850/SB2 can execute the read/write control for an external device by the following two
modes.
•
Mode using DSTB, R/W, LBEN, UBEN, and ASTB signals
•
Mode using RD, WRL, WRH, and ASTB signals
Set these modes by using the BIC bit of the system control register (SYC) (see
Figure 4-1
).
Figure 4-11. Memory Read (1/4)
(a) 0 wait
T1
T2
T3
CLKOUT (output)
A16 to A21 (output)
AD0 to AD15
(input/output)
Address
Data
Address
ASTB (output)
R/W (output)
DSTB, RD (output)
UBEN, LBEN (output)
WAIT (input)
WRH, WRL (output)
H
A1 to A15 (output)
Address
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
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