EM78P259N/260N
8-Bit Microprocessor with OTP ROM
6.10.1 External Reference Signal
The analog signal that is presented at Cin– compares to the signal at Cin+. 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.
6.10.2 Comparator Outputs
ꢀ The compared result is stored in the CMPOUT of IOC80.
ꢀ The comparator outputs are sent to CO (P64) through 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. 6-14 The Output Configuration of a Comparator
Product Specification (V1.0) 06.16.2005
• 59
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
