DA70131-1/3E
III-7
1-1-5. Connecting to a CPU without a wait function
The center device can be connected to a CPU that does not have a wait function.
Let’s look at an example with the CPU interface using I/F mode 4 while it is connected to an Intel 8031 8-bit CPU.
Since this CPU does not have a terminal for executing a wait function, care is needed when programming.
[Points]
1) Set IF1 = H and IF0 = H (I/F mode 4).
2) Since the 8031 does not have a wait terminal, the
____
WRQ
terminal cannot be used.
However, some waiting time is needed to be able to access the center device (since it takes some time to
finish processing a command), and a wait function is therefore essential for continuous access operations.
In the example above, the "
____
IFB
" output terminal on the center device is connected to a port on the 8031.
The
____
IFB
bit is monitored using a routine in the 8031, so that the 8031 does not try to access the center
device while it is processing a command.
Note 1: When you need to control by only 8 bytes, without using the complete address map, the address
signals can be handled as follows:
A3 to A15: Connect these lines to the decoding circuit and use them to create the
___
CS
signal.
A0 to A2: Connect these lines to A0 to A2 on the center device.
A3 to A8 on the center device should be connected to GND.
Note 2: Pull up D8 to D15 to VDD externally (5 to 10 K-ohms).
8031 (intel)
Decoding
circuit
CLK
System reset
A8 to A15
Latch
A0 to A8
G9001A
A9 to A15
A8
P2-7 to P2-0
ALE
P0-7 to P0-0
___
RD
___
WR
_____
INT0
P1-1
CLK
IF1
___
CS
IF0
A8 to A1
D7 to D0
___
RD
___
WR
____
INT
____
IFB
____
RST
Содержание Motionnet G9001A
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