ADC0804 datasheet(37/41 Pages) NSC

Part #	ADC0804

Description	8-Bit uP Compatible A/D Converters

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Manufacturer	NSC [National Semiconductor (TI)]

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Functional Description (Continued)

5.3 Multiple A/D Converters in a Z-80 Interrupt Driven

Mode (Continued)

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 start-

ing 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 sequen-

tial memory locations starting at the arbitrarily chosen ad-

dress X 3E00.

•

The stack pointer must be dimensioned in the main pro-

gram 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:

DS005671-A5

Note 29: All numerical values are hexadecimal representations.

FIGURE 21. Software for Auto-Zeroed Differential A/D

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