STM32W108HB STMicroelectronics, STM32W108HB Datasheet - Page 144
STM32W108HB
Manufacturer Part Number
STM32W108HB
Description
High-performance, IEEE 802.15.4 wireless system-on-chip with embedded Flash memory
Manufacturer
STMicroelectronics
Datasheet
1.STM32W108CC.pdf
(232 pages)
Specifications of STM32W108HB
Receive Current (w/ Cpu)
27 mA
Transmit Current (w/ Cpu, +3 Dbm Tx)
31 mA
Low Deep Sleep Current, With Retained Ram And Gpio
400 nA/800 nA with/without sleep timer
Standard Arm Debug Capabilities
Flash patch & breakpoint; data watchpoint & trace; instrumentation trace macrocell
Single Voltage Operation
2.1-3.6 V with internal 1.8 V and 1.25 V regulators
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General-purpose timers
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Slave mode: External clock mode 2 + Trigger mode
External clock mode 2 can be used in combination with another slave mode (except external
clock mode 1 and encoder mode). In this case, the ETR signal is used as external clock
input, and another input can be selected as trigger input when operating in reset mode,
gated mode or trigger mode. It is not recommended to select ETR as TRGI through the
TIM_TS bits of TIMx_SMCR register.
In the following example, the up-counter is incremented at each rising edge of the ETR
signal as soon as a rising edge of TI1 occurs:
●
●
●
A rising edge on TI1 enables the counter and sets the INT_TIMTIF flag. The counter then
counts on ETR rising edges.
The delay between the rising edge of the ETR signal and the actual reset of the counter is
due to the resynchronization circuit on ETRP input.
Figure 44. Control circuit in External clock mode 2 + Trigger mode
Configure the external trigger input circuit by programming the TIMx_SMCR register as
follows:
–
–
–
Configure the channel 1 as follows, to detect rising edges on TI:
–
–
–
–
Configure the timer in Trigger mode by writing TIM_SMS = 110 in the TIMx_SMCR
register. Select TI1 as the input source by writing TIM_TS = 101 in the TIMx_SMCR
register.
TIM_ETF = 0000: no filter.
TIM_ETPS = 00: prescaler disabled.
TIM_ETP = 0: detection of rising edges on ETR and TIM_ECE = 1 to enable the
external clock mode 2.
TIM_IC1F = 0000: no filter.
The capture prescaler is not used for triggering and does not need to be
configured.
TIM_CC1S = 01in the TIMx_CCMR1 register to select only the input capture
source.
TIM_CC1P = 0 in the TIMx_CCER register to validate the polarity (and detect
rising edge only).
STM32W108HB STM32W108CC STM32W108CB STM32W108CZ
Doc ID 16252 Rev 13
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