MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 358
MCBSTM32EXL
Manufacturer Part Number
MCBSTM32EXL
Description
BOARD EVALUATION FOR STM32F103ZE
Manufacturer
Keil
Specifications of MCBSTM32EXL
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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General-purpose timer (TIMx)
358/995
Bits 13:12 ETPS: External trigger prescaler
Bits 11:8 ETF[3:0]: External trigger filter
Bit 14 ECE: External clock enable
Bit 7 MSM: Master/Slave mode
This bit enables External clock mode 2.
0: External clock mode 2 disabled.
1: External clock mode 2 enabled. The counter is clocked by any active edge on the ETRF
signal.
1: Setting the ECE bit has the same effect as selecting external clock mode 1 with TRGI
connected to ETRF (SMS=111 and TS=111).
2: It is possible to simultaneously use external clock mode 2 with the following slave modes:
reset mode, gated mode and trigger mode. Nevertheless, TRGI must not be connected to
ETRF in this case (TS bits must not be 111).
3: If external clock mode 1 and external clock mode 2 are enabled at the same time, the
external clock input is ETRF.
External trigger signal ETRP frequency must be at most 1/4 of CK_INT frequency. A
prescaler can be enabled to reduce ETRP frequency. It is useful when inputting fast external
clocks.
00: Prescaler OFF.
01: ETRP frequency divided by 2.
10: ETRP frequency divided by 4.
11: ETRP frequency divided by 8.
This bit-field then defines the frequency used to sample ETRP signal and the length of the
digital filter applied to ETRP. 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
0001: f
0010: f
0011: f
0100: f
0101: f
0110: f
0111: f
1000: f
1001: f
1010: f
1011: f
1100: f
1101: f
1110: f
1111: f
0: No action
1: The effect of an event on the trigger input (TRGI) is delayed to allow a perfect
synchronization between the current timer and its slaves (through TRGO). It is useful if we
want to synchronize several timers on a single external event.
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
SAMPLING
=f
=f
=f
=f
=f
=f
=f
=f
=f
=f
=f
=f
=f
=f
=f
CK_INT
CK_INT
CK_INT
DTS
DTS
DTS
DTS
DTS
DTS
DTS
DTS
DTS
DTS
DTS
DTS
/2, N=6.
/2, N=8.
/4, N=6.
/4, N=8.
/8, N=6.
/8, N=8.
/16, N=5.
/16, N=6.
/16, N=8.
/32, N=5.
/32, N=6.
/32, N=8.
Doc ID 13902 Rev 9
, N=2.
, N=4.
, N=8.
DTS
.
RM0008
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