EM78P350N
8-Bit Microprocessor with OTP ROM
6.12.1 External Reference Signal
The analog signal that is presented at Cin– compares to the signal at Cin+, and the
digital output (CO) of the comparator is adjusted accordingly by taking the following
notes into considerations:
NOTE
■ The reference signal must be between Vss and Vdd.
■ The reference voltage can be applied to either pin of the comparator.
■ Threshold detector applications may be of the same reference.
■ The comparator can operate from the same or different reference sources.
6.12.2 Comparator Outputs
The compared result is stored in the CMPOUT of IOCA0.
The comparator outputs are sent to CO (P56) through programming Bit 1,
Bit 0<COS1, COS0> of the IOCA0 register to <1, 0>. See Section 6.2.7, IOCA0
(CMPCON: Comparator Control Register) for Comparator/OP select bits function
description.
NOTE
■ The P56/CO pin priority is as follows:
P60/ADE0/CO Priority
High
CO
Low
P56
The following figure shows the Comparator Output block diagram.
To C0
From OP I/O
CMRD
EN
EN
D
Q
Q
D
To CMPOUT
RESET
To CPIF
CMRD
From other
comparator
Fig. 6-14 Comparator Output Configuration
Product Specification (V 1.0) 09.14.2006
(This specification is subject to change without further notice)
• 77
ELAN [ ELAN MICROELECTRONICS CORP ]
