ST STM8S Reference Manual

RM0016 16-bit advanced control timer (TIM1)
Doc ID 14587 Rev 8 197/449
Channel configured in input
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 f
SAMPLING
, 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, f
SAMPLING
= 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
Note: Even on channels that have a complementary output, this bit field is not preloaded and does
not take into account the content of the CCPC bit (in the TIM1_CR2 register).
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 (TIM1_CCER register).
00: No prescaler, capture is made each time an edge is detected on the capture input
01: Capture is made once every 2 events
10: Capture is made once every 4 events
11: Capture is made once every 8 events
Bits 1:0 CC1S[1:0]: Capture/compare 1 selection
This bitfield defines the direction of the channel (input/output) and 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 (TIM1_SMCR register).
Note: CC1S bits are writable only when the channel is OFF (CC1E = 0 in TIM1_CCER1).

ST STM8S Specifications

General

Brand	ST
Model	STM8S
Category	Microcontrollers
Language	English