MP7612AP EXAR [Exar Corporation], MP7612AP Datasheet - Page 11

• Manufacturer Part Number: MP7612AP
• Description: Octal 12-Bit DAC Array D/A Converter with Output Amplifier and Serial Data/Address uP Control Logic
• Manufacturer: EXAR [Exar Corporation]

Rev. 3.00
NOTES
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NOTES:
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Execute consecutive memory write instructions while manipulating the data between WRITEs so that each
WRITE presents the next bit.
The serial data loading is triggered by the CLK pulse which is asserted by a decoded memory WRITE to
memory location 2000, R/W, and 02. A WRITE to address 4000 transfers data from input shift register to DAC
register.
Clock generated by WR and decoding address 8000.
Data is clocked in the DAC shift register by executing memory write instructions. The clock input is generated
by decoding address 8000 and WR. Data is then loaded into the DAC register with a memory write instruction
to address 4000.
Serial data must be present in the right justified format in registers H & L of the microprocessor.
8085
MC6800
SOD
ALE
WR
DBO to DB7
A0 to A15
R/W
8
8
02
8212
8
Figure 7. MC6800 Interface
Address Bus
Figure 8. 8085 Interface
8
Data Bus
+5
16
11
DB7
SDI
SDI
E1
E3
E2
From SYSTEM RESET
E1
E3
E2
LD
LD
From SYSTEM RESET
A0 to A2
74LS138
A0 to A2
74LS138
Address
Decoder
Address
Decoder
3
3
RST
RST
CLK
CLK
16
8
Data Bus
Address Bus
MP7612