Rainbow Electronics AT83C26 - Manual (Page 57)

57
7511B–SCR–10/05
AT83C26
Reset value = 0x X000 0000
Table 39. INTERFACEB ()
7 6 5 4 3 2 1 0
X CARDC82 CARDIO5 CARDIO4
CARDIO3/CAR
DC42 CARDIO2 DEMBOOSTB1 DEMBOOSTB0
Bit Number Bit Mnemonic Description
7 X
6 CARDC82
Set this bit to drive the CRST3/CC82 pin High with the on-chip pull-up (according to IODIS2 bit
value). The pin can then be an input (read in STATUSB register).
Clear this bit to drive a low level on the CC82 pin (according to IODIS2 bit value).
5 CARDIO5
Set this bit to drive the CIO5 pin High with the on-chip pull-up when isolated from the host (See
“ITDIS ()” on page 59.). The pin can then be an input (read in STATUSB register).
Clear this bit to drive a low level on the CIO5 pin when isolated from the host.
4 CARDIO4
Set this bit to drive the CIO4 pin High with the on-chip pull-up when isolated from the host (See
“ITDIS ()” on page 59.). The pin can then be an input (read in STATUSB register).
Clear this bit to drive a low level on the CIO4/C45 pin when isolated from the host.
3
CARDIO3/
CARDC42
Set this bit to drive the CIO3/CC42 pin High with the on-chip pull-up when isolated from the host
(See “ITDIS ()” on page 59.). The pin can then be an input (read in STATUSB register).
Clear this bit to drive a low level on the CIO3/CC42 pin when isolated from the host.
This bit is CIO3 when AUX=0 or when AUX=1 and IFN=2, otherwise it is CC42.
2 CARDIO2
Set this bit to drive the CIO2 pin High with the on-chip pull-up when isolated from the host (See
“ITDIS ()” on page 59.). The pin can then be an input (read in STATUSB register).
Clear this bit to drive a low level on the CIO2 pin when isolated from the host.
1-0 DEMBOOSTB[1-0]
Configuration for DC/DCB startup current.
00: Normal: 80 mA average
01: Normal + 18%
10: Normal + 18% (and boost on oscillator)
11: Normal + 40%