EM78P257
OTP ROM
• The reference voltage can be applied to either pin of a comparator
• Threshold detector applications may use the same references
• The comparator can operate from the same or different reference sources
• There are 16 combinations of the negative inputs of the four comparators
Name
Bit 7
-
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
CI3
Bit 2
CI2
Bit 1
CI1
Bit 0
CI0
CMPCR/IOC90
Table 12 The List of CO-INPUT Combine Sequence
CI3 CI2 CI1 CI0 CO- Input combine status
Comment
1,2,3, and 4 -> negative inputs,
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
N/A
1,2
CIN2- -> negative input; CIN1- -> normal I/O pin;
CIN3- -> negative input; CIN1- -> normal I/O pin;
CIN4- -> negative input; CIN1- -> normal I/O pin;
CIN3- -> negative input; CIN2- -> normal I/O pin;
CIN4- -> negative input; CIN2- -> normal I/O pin;
CIN4- -> negative input; CIN3- -> normal I/O pin;
CIN3- -> negative input; CIN(1,2)- -> normal I/O pin;
CIN4- -> negative input; CIN(1,2)- -> normal I/O pin;
CIN4- -> negative input; CIN(1,3)- -> normal I/O pin;
CIN4- -> negative input; CIN(2,3)- -> normal I/O pin;
CIN4- -> negative input; CIN(1,2,3)- -> normal I/O pin;
CIN2- -> negative input; CIN3- -> normal I/O pin;
CIN2- -> negative input; CIN4- -> normal I/O pin;
CIN2- -> negative input; CIN(3,4)- -> normal I/O pin;
CIN3- -> negative input; CIN(1,4)- -> normal I/O pin;
1,3
1,4
2,3
2,4
3,4
1,2,3
1,2,4
1,3,4
2,3,4
1,2,3,4
3,2
4,2
4,3,2
1,4,3
Example: ( CI3,CI2,CI1,CI0)= (1010) => Comparator 4(-) combine together with Comparator 3(-) and Comparator
2(-), and both of CIN3- and CIN2- work as normal I/O pins.
This specification is subject to change without prior notice.
44
07.27.2004 (V1.4)
ELAN [ ELAN MICROELECTRONICS CORP ]
