Rainbow-electronics AT83C26 Manual do Utilizador descarregar pdf (Página 42)

7511B–SCR–10/05

AT83C26

Reset value = 0x X000 0000

Table 21. SC1_CFG4 (Config Byte 4 for SC1)

7 6 5 4 3 2 1 0

X DEMBOOSTA1 DEMBOOSTA0 STEPREGA INT_PULLUP X X CRST_SEL1

Bit Number Bit Mnemonic Description

7 X

6-5 DEMBOOSTA[1-0]

DC/DC A Maximum Startup Current drawn from power supply

00: Normal: 80 mA average

01: Normal + 18%

10: Normal + 18% (and boost on oscillator)

11: Normal + 40%

4 STEPREGA

Step Regulator mode

Clear this bit to enable the automatic step-up converter (CVCC is stable even if VCC is not

higher than CVCC).

Set this bit to permanently disable the step-up converter (CVCC is stable only if VCC is

sufficiently higher than CVCC).

This bit must always be set if no external self is used

3 INT_PULLUP

Internal pull-up

Set this bit to activate the internal pull-up (connected internally to VCC) on INT pin.

Clear this bit to deactivate the internal pull-up.

2 X

1 X

0 CRST_SEL1

Card Reset Selection

Set this bit to have the CRST1 pin driven by hardware through the A1/RST pin.

Clear this bit to have the CRST1 pin driven by software through the CARDRST bit.

The reset value is 0.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 76 77

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