EM78808
8-bit Micro-controller
IOC6 (PORT6 I/O control, CDA, PORT switch, LCD driving control)
PAGE0 (PORT6 I/O control register)
7
6
5
4
3
2
1
0
IOC67
IOC66
IOC65
IOC64
IOC63
IOC62
IOC61
IOC60
Bit 0~Bit 7(IOC60~IOC67) : PORT6(0~7) I/O direction control register
0 ꢂput the relative I/O pin as output
1 ꢂput the relative I/O pin into high impedance
PAGE1 (Current DA control,)
7
6
5
4
3
2
1
0
DAEN
DA6
DA5
DA4
DA3
DA2
DA1
DA0
Bit 0~Bit 6(DA0~DA6) : Current DA output buffer
User can use this buffer to control the output current of current DA for the driving transistor of speaker.
Bit 7 (DAEN) : Current DA enable control
0/1 ꢂdisable/enable
VDD
DA6..DA0
DAOUT
PORT66
current DA
circuit
PORT66
MUX
DAS
DAEN
Fig.20 Current DA structure
PAGE 2 (PORT switch, LCD driving ability control)
7
6
5
4
3
2
1
0
PCSH
PCSL
PBS
LCDDV1 LCDDV0
CDAL2
CDAL1
CDAL0
Bit 0~Bit 2(DAL0~DAL1) : change output level of current DA
CDAL2 CDAL1 CDAL0
Output level
L0 (ratio = 1/8)
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
L1 (ratio = 2/8)
L2 (ratio = 3/8)
L3 (ratio = 4/8)
L4 (ratio = 5/8)
L5 (ratio = 6/8)
L6 (ratio = 7/8)
L7 (ratio =1)
______________________________________________________________________________________________________________________________________________________
* This specification is subject to change without notice.
8/1/2004 (V3.1)
34
ELAN [ ELAN MICROELECTRONICS CORP ]
