Programming The Compare-Only Channels - Intel 8XC196NT User Manual

10.5.4 Programming the Compare-only Channels

To program a compare event, you must first write to the COMPx_CON (Figure 10-11) register to
configure the compare-only channel and then load the event time into COMPx_TIME.
COMPx_CON has the same bits and settings as EPAx_CON. COMPx_TIME is functionally iden-
tical to EPAx_TIME.
COMP x _CON
x = 0–1
The EPA compare control (COMP x _CON) registers determine the function of the EPA compare
channels.
7
TB CE
Bit Bit
Number Mnemonic
7 TB
6 CE
5:4 M1:0
3 RE
Figure 10-11. EPA Compare Control (COMP x _CON) Registers
M1 M0
Time Base Select
Specifies the reference timer.
0 = timer 1 is the reference timer and timer 2 is the opposite timer
1 = timer 2 is the reference timer and timer 1 is the opposite timer
A compare event (start of an A/D conversion; clearing, setting, or
toggling an output pin; and/or resetting either timer) occurs when the
reference timer matches the time programmed in the event-time register.
Compare Enable
This bit enables the compare function.
0 = compare function disabled
1 = compare function enabled
EPA Mode Select
Specifies the type of compare event.
M1 M0
0 0 no output
0 1 clear output pin
1 0 set output pin
1 1 toggle output pin
Re-enable
Allows a compare event to continue to execute each time the event-time
register (COMP x _TIME) matches the reference timer rather than only
upon the first time match.
0 = compare function will drive the output only once
1 = compare function always enabled
EVENT PROCESSOR ARRAY (EPA)
Address:
Reset State:
RE AD ROT
Function
1F88H ( x = 0)
1F8CH ( x = 1)
00H
0
RT
10-25