STM32W108CBU64TR STMicroelectronics, STM32W108CBU64TR Datasheet - Page 135

• Manufacturer Part Number: STM32W108CBU64TR
• Description: MCU, RF, 32BIT, 128K FLASH, 48VFQFPN
• Manufacturer: STMicroelectronics
• Series: STM32r

Specifications of STM32W108CBU64TR

• Controller Family/series: STM32
• Core Size: 32bit
• No. Of I/o's: 24
• Program Memory Size: 128KB
• Ram Memory Size: 8KB
• Cpu Speed: 24MHz
• Oscillator Type: Internal, External
• No. Of Timers: 2
• Rohs Compliant: Yes
• Applications: RF4CE, Remote Control
• Core Processor: ARM® Cortex-M3™
• Program Memory Type: FLASH (128 kB)
• Controller Series: STM32W
• Ram Size: 8K x 8
• Interface: I²C, SPI, UART/USART
• Number Of I /o: 24
• Voltage - Supply: 1.18 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-VFQFN Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

STM32W108CB, STM32W108HB
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Figure 46. Gating Timer 2 with enable of Timer 1
Using one timer to start the other timer
In this example, the enable of Timer 2 is set with the update event of Timer 1. Refer to
Figure 44
zero) on the divided internal clock as soon as Timer 1 generates the update event.
When Timer 2 receives the trigger signal its TIM_CEN bit is automatically set and the
counter counts until 0 is written to the TIM_CEN bit in the TIM2_CR1 register. Both counter
clock frequencies are divided by 3 by the prescaler compared to CK_INT (fCK_CNT =
fCK_INT/3).
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Reset Timer 2 by writing 1 in the TIM_UG bit (TIM2_EGR register).
Initialize Timer 2 to 0xE7 by writing 0xE7 in the Timer 2 counter (TIM2_CNTL).
Enable Timer 2 by writing 1 in the TIM_CEN bit (TIM2_CR1 register).
Start Timer 1 by writing 1 in the TIM_CEN bit (TIM1_CR1 register).
Stop Timer 1 by writing 0 in the TIM_CEN bit (TIM1_CR1 register).
Configure Timer 1 in master mode to send its update event as trigger output
(TIM_MMS = 010 in the TIM1_CR2 register).
Configure the Timer 1 period (TIM1_ARR register).
Configure Timer 2 to get the input trigger from Timer 1 (TIM_TS = 000 in the
TIM2_SMCR register).
Configure Timer 2 in trigger mode (TIM_SMS = 110 in the TIM2_SMCR register).
Start Timer 1: Write 1 in the TIM_CEN bit (TIM1_CR1 register).
for connections. Timer 2 starts counting from its current value (which can be non-
Doc ID 16252 Rev 8
General-purpose timers
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