em78p257 ELAN Microelectronics Corp, em78p257 Datasheet - Page 23

• Manufacturer Part Number: em78p257
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

This specification is subject to change without prior notice.
6. IOCA0 ( CO- INPUT Combine sequence)
•There are 16 combinations of the negative inputs of the four comparators.
1 = Comparator CO1 is on.
For EM78P257B
For EM78P257A
For EM78P257B
Pin 18 can choose P51 or TCC3 only. If MOUSEN is ‘1’, define as an input of TCCB (TCC3). If
MOUSEN is ‘0’, then the choice is decided by TCCBTS of RB.
Pin 17 can choose P50 or TCC4 only. If MOUSEN is ‘1’ and TCC4E of IOC80 is ‘1’ also, then
choose TCC4, otherwise choose P50.
Pin 16 can choose P55 or OSCI only, and the choice is decided by Bit 9,8,7 of CODE option. When
choice is ‘1,1, 1’, then Pin 16 is defined as P55, otherwise the status is defined as OSCI.
Pin 19 can choose P51 or TCC3 only. If MOUSEN is ‘1’, define as an input of TCCB (TCC3), if
MOUSEN is ‘0’, then the choice is decided by TCCBTS of RB.
Pin 18 can choose P50 or TCC4 only. If MOUSEN is ‘1’ and TCC4E of IOC80 is ‘1’ also, then
choose TCC4, otherwise choose P50.
Pin 17 can choose P55 or OSCI only, and the choice is decided by Bit 9,8,7 of CODE option. When
choice is ‘1,1,1’, then Pin 17 is defined as P55, otherwise the status is defined as OSCI.
Pin 18 can choose P51 or CO1 only, and the choice is decided by COIE1 of IOC90.
Pin 17 can choose CIN1+ only.
Pin 16 can choose P55 ,CIN1- or OSCI, and is decided by IOCA0. If CIN1- was not chosen as
comparator1(-) input, then this pin’s status will be decided by Bit 9,8,7 of CODE option. When
choice is ‘1,1,1’, then Pin 16 is defined as P55, otherwise the status is defined as OSCI.
Pin 19 can choose P51 or CO1 only, and the choice is decided by COIE1of IOC90.
Pin 18 can choose CIN1+ only.
Pin 17 can choose P55 ,CIN1- or OSCI, and is decided by IOCA0. If CIN1- was not chosen as
comparator1(-) input, then this pin’s status will be decided by Bit 9,8,7 of CODE option. When
choice is ‘1,1,1’, then Pin 17 is defined as P55, otherwise the status is defined as OSCI.
7
-
6
-
5
-
4
-
23
CI3
3
CI2
2
CI1
EM78P257
1
07.27.2004 (V1.4)
OTP ROM
CI0
0