EM78P5840NP Ver la hoja de datos (PDF) - ELAN Microelectronics

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EM78P5840NP

8-Bit Microcontrollers

ELAN Microelectronics 

EM78P5840N/41N/42N

8-Bit Microcontrollers

ERIC’s oscillation frequency is based on the

IRC2’s CLK (determined by code option

“IRC2S”). For example, if IRC2S = 0, then

IRC2’s oscillation frequency is 2MHz. The

system CLK can then be changed by adjusting

R. However, in this case, the system CLK will

always be greater than 2M. That is to say, the

system CLK can only be adjusted to between

2M and 6M. The following table shows the

relation between the system oscillating CLK and

the external resistor values.

ERIC

EM78P5840

VDD

R

Figure 7-11a ERIC Mode Application

Circuit

The relationship between the system oscillating CLK and the external resistor values:

Frequency (Hz)

6M

5M

4M

3.58M

2.1M

External Resistor (Ω)

34K

41K

51K

57K

97K

Operating Voltage (VDD)

3.0 ~5.5 V

2.8 ~5.5 V

2.5 ~5.5 V

2.2 ~5.5 V

2.2 ~5.5 V

In ERIC mode, only two active modes can be achieved, i.e., Normal and Sleep modes.

See the following figure (Figure 6-11b) for more details.

Reset

(CPU stop)

Sleep

Mode

IRC or ERIC: OFF

IRPCL1L::OtuNrn off

PLL : turn off

RESET

operation

Reset

run "SLEP"

Normal

Mode

EIRRCC oorr EIRRCIC2::OONN

IPRPLCLLL1:::tuOturNnrnooffff

Figure 7-11b Relationship between Normal and Sleep Modes in IRC and ERIC Modes

Product Specification (V1.0) 04.25.2006

(This specification is subject to change without further notice)

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