EM78P257
OTP ROM
Pin 8 can choose P61 ,CIN3- or TCC1, and is decided by IOCA0. If CIN3- was not chosen as
comparator1(-) input, then this pin’ s status will be decided by TCCATS of RA. When TCCATS is ‘ 1’ ,
then Pin 8 is defined as TCC1, otherwise the status is defined as P61.
• Bit 1 (CE2): Comparator (CO2) enable bit
0 = Comparator is CO2 off (default value).
For EM78P257A
Pin 1 can choose P52 only.
Pin 2 can choose P53 only.
Pin 3 can choose P54 or TCC only, and is decided by Bit 5 of Control Register (CONT-5). When TS
is ‘ 1’ , then Pin 3 is defined as TCC, otherwise the status is defined as P54.
For EM78P257B
Pin 2 can choose P52 only.
Pin 3 can choose P53 only.
Pin 4 can choose P54 or TCC only, and is decided by Bit 5 of Control Register (CONT-5). When TS
is ‘ 1’ , then Pin 4 is defined as TCC, otherwise the status is defined as P54.
1 = Comparator is CO2 on.
For EM78P257A
Pin 1 can choose P52 or CO2 only, and decided by COIE2 of IOC90.
Pin 2 can choose CIN2+ only.
Pin 3 can choose P54 ,CIN2- or TCC, and is decided by IOCA0. If CIN2- was not chosen as
comparator1(-) input, then this pin will be decided by Bit 5 of Control Register (CONT-5). When TS
is ‘ 1’ , then Pin 3 is defined as TCC, otherwise status is defined as P54.
For EM78P257B
Pin 2 can choose P52 or CO2 only, and decided by COIE2 of IOC90.
Pin 3 can choose CIN2+ only.
Pin 4 can choose P54 ,CIN2- or TCC as decided by IOCA0. If CIN2- was not chosen as
comparator1(-) input, then this pin will be decided by Bit 5 of Control Register (CONT-5). When TS
is ‘ 1’ , then Pin 4 is defined as TCC, otherwise status defined as P54.• Bit 0 (CE1): Comparator
(CO1) enable bit
0 = Comparator CO1 is off (default value).
For EM78P257A
This specification is subject to change without prior notice.
22
07.27.2004 (V1.4)
ELAN [ ELAN MICROELECTRONICS CORP ]
