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8XC196NP, 80C196NU USER'S MANUAL
10.5.3 Programming the Capture/Compare Channels
The EPAx_CON register controls the function of its assigned capture/compare channel. The reg-
isters for EPA0 and EPA2 are identical. The registers for EPA1 and EPA3 have an additional bit,
the remap bit (RM), which is used to enable and disable remapping for high-speed PWM gener-
ation (see "Generating a High-speed PWM Output" on page 10-14). This added bit (bit 8) re-
quires an additional byte, so EPA1_CON and EPA3_CON must be addressed as words, while the
others can be addressed as bytes.
To program a compare event, write to EPAx_CON (Figure 10-10) to configure the EPA cap-
ture/compare channel and then load the event time into EPAx_TIME. To program a capture event,
you need only write to EPAx_CON. Table 10-5 shows the effects of various combinations of
EPAx_CON bit settings.
Table 10-5. Example Control Register Settings and EPA Operations
TB
CE
MODE
7
6
5
4
X
0
0
0
X
0
0
1
X
0
1
0
X
0
1
1
X
0
X
1
X
0
1
X
TB
CE
MODE
7
6
5
4
X
1
0
0
X
1
0
1
X
1
1
0
X
1
1
1
X
1
X
X
X
1
X
X
NOTES:
— = bit is not used
X = bit may be used, but has no effect on the described operation. These bits cause other oper-
ations to occur.
10-18
Capture Mode
RE
—
ROT
ON/RT
3
2
1
0
—
0
—
0
—
0
X
X
—
0
X
X
—
0
X
X
—
0
1
X
—
0
1
X
Compare Mode
RE
—
ROT
ON/RT
3
2
1
0
X
0
—
0
X
0
X
X
X
0
X
X
X
0
X
X
X
0
0
1
X
0
1
1
Operation
None
Capture on falling edges
Capture on rising edges
Capture on both edges
Reset opposite timer
Reset opposite timer
Operation
None
Clear output pin
Set output pin
Toggle output pin
Reset same timer
Reset opposite timer
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