EM78459AM datasheet(34/62 Pages) EMC

34 / 62 page

EM78458/459

8-Bit Microcontroller with MASK ROM

•

Product Specification (V1.4) 05.27.2005

(This specification is subject to change without further notice)

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

4.7.1 ADC Control Register (ADCON/R9, AD-CMP-CON/IOCA0,

GCON/IOC90)

4.7.1.1 ADCON/R9

The ADCON register controls the operation of the A/D conversion and decides which

pin should be currently active.

BIT

SYMBOL

IOCS

ADRUN

ADPD

ADIS2

ADIS1

ADIS0

*Init_Value

*Init_Value: Initial value at power on reset

ADRUN (bit 4):

ADC starts to RUN.

1 = an A/D conversion is started. This bit can be set by software.

0 = reset on completion of the conversion. This bit can not be reset in

software.

ADPD (bit 3):

ADC Power-down Mode.

1 = ADC is operating;

0 = switch off the resistor reference to save power even when the CPU

is operating

EM78459AM Datasheet(PDF) 34 Page - ELAN Microelectronics Corp

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