EM6640WP27 datasheet(10/62 Pages) EMMICRO

Part #	EM6640WP27

Description	Low Power Microcontroller with EEPROM AND RC Oscillator

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Manufacturer	EMMICRO [EM Microelectronic - MARIN SA]

Direct Link	http://www.emmicroelectronic.com

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10 / 62 page

EM6640

03/02 REV. C/446

Copyright

 2002, EM Microelectronic-Marin SA

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4.4 Sleep Counter Reset (SCR)

The Sleep Counter Reset, active only in SLEEP mode, will automatically trigger a reset which cancels Sleep Mode

after a programmable time defined by writing bit RstSlpTSel[2:0] in option register OptSlpCntRst. The

EnSlpCntRst bit in option register OptSlpCntRst set to "1" will enable the SCR as soon as the SLEEP bit in

RegSysCntl1 is written active. In this case, all the sleep considerations (low consumption) are taken into account

(refer to chapter SLEEP Mode, page 5 for more details). When the SCR generates a reset, the CPU reset is

removed after the ‘CPU Reset Delay’.

The typical time constant of SCR is defined in the section EM6640 Electrical specifications, on page 55.

=> The minimum programmable time is 1x the time constant.

=> The maximum programmable time is 128x the time constant.

Figure 9 Sleep Counter Reset representation with SCR timing=2x as an example.

Sy sC lk

S leep

SCR

CPU re se t

S C R tim ing = 2x

CP U Rst De la y

ac tiv e m ode

activ e m ode

S leep m ode

Table 10 register OptSlpCntRst

Bit

Name

Reset

R/W

Description

3

EnSlpCntRst

0

R/W

enable SCR

2

RstSlpTSel[2]

0

R/W

timing selection

1

RstSlpTSel[1]

0

R/W

timing selection

0

RstSlpTSel[0]

0

R/W

timing selection

Table 11 Sleep Counter Reset timing

RstSlpTSel[2]

RstSlpTSel[1]

RstSlpTSel[0]

SCR timing

00

0

1x

00

1

2x

01

0

4x

01

1

8x

1

0

16x

1

0

1

32x

1

0

64x

1

128x

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