ST STM8S Reference Manual

RM0016 16-bit general purpose timers (TIM2, TIM3, TIM5)
Doc ID 14587 Rev 8 231/449
Channel configured in input
Bits 1:0 CC1S[1:0]: Capture/compare 1 selection
This bitfield defines the direction of the channel (input/output) as well as the used input.
00: CC1 channel is configured as output
01: CC1 channel is configured as input, IC1 is mapped on TI1FP1
10: CC1 channel is configured as input, IC1 is mapped on TI2FP1
11: CC1 channel is configured as input, IC1 is mapped on TRC. This mode works only if an internal
trigger input is selected through the TS bit (TIM5_SMCR register).
Note: CC1S bits are writable only when the channel is off (CC1E = 0 and is updated in
TIMx_CCER1).
76543210
IC1F[3:0] IC1PSC[1:0] CC1S[1:0]
rw rw rw rw rw
rw
rw rw
Bits 7:4 IC1F[3:0]: Input capture 1 filter
This bitfield defines the frequency used to sample TI1 input and the length of the digital filter applied
to TI1. The digital filter is made of an event counter in which N events are needed to validate a
transition on the output:
0000: No filter, sampling is done at f
MASTER
0001: f
SAMPLING
= f
MASTER
, N = 2
0010: f
SAMPLING
= f
MASTER
, N = 4
0011: f
SAMPLING
= f
MASTER
, N = 8
0100: f
SAMPLING
= f
MASTER
/2, N = 6
0101: f
SAMPLING
= f
MASTER
/2, N = 8
0110: f
SAMPLING
= f
MASTER
/4, N = 6
0111: f
SAMPLING
= f
MASTER
/4, N = 8
1000: f
SAMPLING
= f
MASTER
/8, N = 6
1001: f
SAMPLING
= f
MASTER
/8, N = 8
1010: f
SAMPLING
= f
MASTER
/16, N = 5
1011: f
SAMPLING
= f
MASTER
/16, N = 6
1100: f
SAMPLING
= f
MASTER
/16, N = 8
1101: f
SAMPLING
= f
MASTER
/32, N = 5
1110: f
SAMPLING
= f
MASTER
/32, N = 6
1111: f
SAMPLING
= f
MASTER
/32, N = 8
Bits 3:2 IC1PSC[1:0]: Input capture 1 prescaler
This bitfield defines the ratio of the prescaler acting on CC1 input (IC1). The prescaler is reset as
soon as CC1E = 0 (TIMx_CCER register).
00: no prescaler, capture is done each time an edge is detected on the capture input
01: Capture is done once every 2 events
10: Capture is done once every 4 events
11: Capture is done once every 8 events
Note: The internal event counter is not reset when IC1PSC is changed on the fly. In this case the old
value is used until the next capture occurs. To force a new value to be taken in account
immediately, the CC1E bit can be cleared and set again.

ST STM8S Specifications

General

Brand	ST
Model	STM8S
Category	Microcontrollers
Language	English