ADC0801, ADC0802
ADC0803, ADC0804, ADC0805
SNOSBI1B –NOVEMBER 2009–REVISED FEBRUARY 2013
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NOTE: All numerical values are hexadecimal representations.
Figure 65. Software for Auto-Zeroed Differential A/D
The following notes apply:
•
It is assumed that the CPU automatically performs a RST 7 instruction when a valid interrupt is acknowledged
(CPU is in interrupt mode 1). Hence, the subroutine starting address of X0038.
•
•
The address bus from the Z-80 and the data bus to the Z-80 are assumed to be inverted by bus drivers.
A/D data and identifying words will be stored in sequential memory locations starting at the arbitrarily chosen
address X 3E00.
•
•
The stack pointer must be dimensioned in the main program as the RST 7 instruction automatically pushes
the PC onto the stack and the subroutine uses an additional 6 stack addresses.
The peripherals of concern are mapped into I/O space with the following port assignments:
HEX PORT ADDRESS
PERIPHERAL
HEX PORT ADDRESS
PERIPHERAL
A/D 4
00
01
02
03
MM74C374 8-bit flip-flop
04
05
06
07
A/D 1
A/D 2
A/D 3
A/D 5
A/D 6
A/D 7
40
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