Rainbow Electronics AT83C26 - Manual (Page 42)

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.