EM78P341N/342N/343N
8-Bit Microprocessor with OTP ROM
6.10.1 External Reference Signal
The analog signal that is presented at Cin – is compared to the signal at Cin+. The
digital output (CO) of the comparator is adjusted accordingly by taking into
consideration the following notes:
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.
6.10.2 Comparator Outputs
The compared result is stored in the CMPOUT of IOC80.
The comparator outputs are sent to CO (P64) by programming Bit 4 & Bit 3
<COS1, COS0> of the IOC80 register to <1,0>. See table under Section 6.2.4,
IOC80 (Comparator and TCCA Control Registers) for Comparator/OP select bits
function description.
The following figure shows the Comparator Output block diagram.
To C0
From OP I/O
CMRD
EN
EN
Q
D
Q
D
To CMPOUT
RESET
To CPIF
CMRD
From other
comparator
Fig. 6-16 Comparator Output Configuration
Product Specification (V1.0) 12.01.2006
(This specification is subject to change without further notice)
• 67
ELAN [ ELAN MICROELECTRONICS CORP ]
