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EM78P5841NM

8-Bit Microcontrollers

ELAN Microelectronics 

EM78P5840N/41N/42N

8-Bit Microcontrollers

Bit 1 (undefined): This bit is not used. However, it must be cleared to “0” to preclude

possible error.

Bit 2 (ADPWR): AD converter power control

"0" : disable

"1" : enable

Bit 3 ~ Bit 4 (ADCLK0 ~ ADCLK1): AD circuit‘s sampling clock source.

In Crystal mode:

ADCLK1

0

0

1

1

ADCLK0

0

1

0

1

Sampling Rate Operating Voltage

74.6K

37.4K

18.7K

9.3K

>=3.5V

>=3.0V

>=2.5V

>=2.5V

In IRC or ERIC mode:

In these modes, the AD converter rate is set by the oscillator. The

formula for the input frequency and the AD converter rate is:

Oscillator / 4

( ) AD Converter rate = 2 ADCLK /12

For example, if input CLK = 4MHz:

ADCLK1

ADCLK0 Sampling Rate Operation Voltage

0

0

83.3K

>=3.5V

0

1

41.7K

>=3.0V

1

0

20.8K

>=2.5V

1

1

10.4K

>=2.5V

Note: The AD converter (ADC) rate must not be over 50kHz. Otherwise,

the ADC resolution will decrease.

This is a CMOS multi-channel 10-bit successive approximation of the

A/D converter. Its features are as follows:

• 74.6kHz maximum conversion speed (Crystal mode) at 5V

• Adjustable full scale input

• Internal (VDD) reference voltage

• Eight analog inputs multiplexed into one AD converter

• Power-down mode for power saving

• Complete AD conversion interrupt

• Interrupt register, AD control, and status register, and AD data register

24 •

Product Specification (V1.0) 04.25.2006

(This specification is subject to change without further notice)

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