EM78P257AM datasheet(22/91 Pages) EMC

22 / 91 page

EM78P257

OTP ROM

This specification is subject to change without prior notice.

07.27.2004 (V1.4)

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

EM78P257AM Datasheet(PDF) 22 Page - ELAN Microelectronics Corp