CC1110Fx / CC1111Fx
0xFFFF
0x0000
OVFIF = 1
OVFIF = 1
Figure 28: Free-running Mode
13.6.2.2 Modulo Mode
When T1CC0 is reached, the T1CTL.OVFIF
flag is set. The IRCON.T1IF flag is only
asserted if the corresponding interrupt mask
bit TIMIF.OVFIM is set. An interrupt request
is generated when both TIMIF.OVFIM and
IEN1.T1EN are set to 1. The modulo mode
can be used for applications where a period
other than 0xFFFF is required.
In modulo mode the counter starts from
0x0000 and increments at each active clock
edge. When the counter value matches the
terminal count value T1CC0(overflow), held in
the registers T1CC0H:T1CC0L, the counter is
loaded
with
0x0000
and
continues
incrementing its value as shown in Figure 29.
T1CC0
0x0000
OVFIF = 1
OVFIF = 1
Figure 29: Modulo Mode
flag is set. The IRCON.T1IF flag is only
13.6.2.3 Up/Down Mode
asserted if the corresponding interrupt mask
bit TIMIF.OVFIM is set. An interrupt request
is generated when both TIMIF.OVFIM and
IEN1.T1EN are set to 1. The up/down mode
can be used when symmetrical output pulses
are required with a period other than 0xFFFF,
and therefore allows implementation of centre-
aligned PWM output applications.
In up/down mode the counter starts from
0x0000 and increments at each active clock
edge. When the counter value matches the
terminal count value T1CC0, held in the
registers T1CC0H:T1CC0L, the counter counts
down until 0x0000 is reached and it starts
counting up again as shown in Figure 30.
When 0x0000 is reached, the T1CTL.OVFIF
T1CC0
0x0000
OVFIF = 1
OVFIF = 1
Figure 30: Up/Down Mode
13.6.3 Channel Mode Control
13.6.4 Input Capture Mode
The channel mode is set with each channel’s
control and status register T1CCTLn. The
settings include input capture and output
compare modes.
When a channel is configured as an input
capture channel, the I/O pin associated with
that channel, is configured as an input. After
the timer has been started, a rising edge,
falling edge or any edge on the input pin will
trigger a capture of the 16-bit counter contents
into the associated capture register. Thus the
timer is able to capture the time when an
external event takes place.
Note: Before an I/O pin can be used by the
timer, the required I/O pin must be configured
as a Timer 1 peripheral pin as described in
section 13.4.6 on page 92 .
SWRS033E
Page 115 of 239
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