EM78P458AP datasheet(31/76 Pages) EMC

31 / 76 page

EM78P458/459

OTP ROM

Fig. 11 Interrupt Input Circuit

4.7 Analog-To-Digital Converter (ADC)

The analog-to-digital circuitry consists of an 8-bit analog multiplexer, three control registers

(ADCON/R9, AD-CMP-CON/IOCA0, GCON/IOC90), one data register (ADDATA/RA) and an ADC

with 8-bit resolution. The functional block diagram of the ADC is shown in Fig. 12. The analog

reference voltage (Vref) and analog ground are connected via separate input pins.

The ADC module utilizes successive approximation to convert the unknown analog signal into a

digital value. The result is fed to the ADDATA. Input channels are selected by the analog input

multiplexer via the ADCON register Bits ADIS0, ADIS1, and ADIS2.

OP2

GCON

ADDATA

OP1

DATA BUS

ADC4

ADC3

ADC2

ADC1

ADC5

ADC6

ADC7

ADC8

Vref

Power-Down

Fsco

Internal

4-1

MUX

ADC

( successive approximation )

AD-CMPCON

ADCON

Start to Convert

Fig. 12 The Functional Block Diagram of Analog-to-Digital Conversion

This specification is subject to change without prior notice.

06.25.2004 (V1.4)

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