STM32W108CZ STMicroelectronics, STM32W108CZ Datasheet - Page 139
STM32W108CZ
Manufacturer Part Number
STM32W108CZ
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 STM32W108CZ
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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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ
Table 86.
An external incremental encoder can be connected directly to the MCU without external
interface logic. However, comparators are normally used to convert an encoder's differential
outputs to digital signals, and this greatly increases noise immunity. If a third encoder output
indicates the mechanical zero (or index) position, it may be connected to an external
interrupt input and can trigger a counter reset.
Figure 39
direction control. It also shows how input jitter is compensated for when both inputs are used
for counting. This might occur if the sensor is positioned near one of the switching points.
This example assumes the following configuration:
●
●
●
●
●
●
Figure 39. Example of counter operation in encoder interface mode
Counting on
TI1 only
Counting on
TI2 only
Counting on
TI1 and TI2
Active
edges
TIM_CC1S = 01 (TIMx_CCMR1 register, IC1FP1 mapped on TI1).
TIM_CC2S = 01 (TIMx_CCMR2 register, IC2FP2 mapped on TI2).
TIM_CC1P = 0 (TIMx_CCER register, IC1FP1 non-inverted, IC1FP1 = TI1).
TIM_CC2P = 0 (TIMx_CCER register, IC2FP2 non-inverted, IC2FP2 = TI2).
TIM_SMS = 011 (TIMx_SMCR register, both inputs are active on both rising and falling
edges).
TIM_CEN = 1 (TIMx_CR1 register, counter is enabled).
gives an example of counter operation, showing count signal generation and
Counting direction versus encoder signals
Level on opposite
signal (TI1FP1 for
TI2, TI2FP2 for
High
High
High
TI1)
Low
Low
Low
Doc ID 16252 Rev 13
No Count
No Count
Rising
Down
Down
Up
Up
TI1FP1 signal
No Count
No Count
Falling
Down
Down
Up
Up
No Count
No Count
General-purpose timers
Rising
Down
Down
Up
Up
TI2FP2 signal
No Count
No Count
Falling
Down
Down
Up
Up
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