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參數(shù)資料
| 型號(hào)： | STM32W108HBU7 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, QCC40 |
| 封裝： | 6 X 6 MM, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-40 |
| 文件頁(yè)數(shù)： | 4/198頁(yè) |
| 文件大小： | 2871K |
| 代理商： | STM32W108HBU7 |
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STM32W108CB, STM32W108HB
General-purpose timers
Doc ID 16252 Rev 3
101/198
Register (TIM2_OR) has four single bit fields (TIM_REMAPCy) that control whether a Timer
2 channel is mapped to its default GPIO in port PA, or remapped to a GPIO in PB.
Table 23 specifies the pins that may be assigned to Timer 1 and Timer 2 functions.
The TIMxCLK and TIMxMSK inputs can be used only in the external clock modes: refer to
the External Clock Source Mode 1 and External Clock Source Mode 2 sections for details
concerning their use.
10.1.1
Time-base unit
The main block of the general purpose timer is a 16-bit counter with its related auto-reload
register. The counter can count up, down, or alternate up and down. The counter clock can
be divided by a prescaler.
The counter, the auto-reload register, and the prescaler register can be written to or read by
software. This is true even when the counter is running.
The time-base unit includes:
●
Counter register (TIMx_CNT)
●
Prescaler register (TIMx_PSC)
●
Auto-reload register (TIMx_ARR)
Some timer registers cannot be directly accessed by software, which instead reads and
writes a "buffer register". The internal registers actually used for timer operations are called
"shadow registers".
The auto-reload register is buffered. Writing to or reading from the auto-reload register
accesses the buffer register. The contents of the buffer register are transferred into the
shadow register permanently or at each update event (UEV), depending on the auto-reload
buffer enable bit (TIM_ARBE) in the TIMx_CR1 register. The update event is generated
when both the counter reaches the overflow (or underflow when down-counting) and when
the TIM_UDIS bit equals 0 in the TIMx_CR1 register. It can also be generated by software.
Update event generation is described in detail for each configuration.
The counter is clocked by the prescaler output CK_CNT, which is enabled only when the
counter enable bit (TIM_CEN) in the TIMx_CR1 register is set. Refer also to the slave mode
controller description in the Timers and External Trigger Synchronization section to get more
details on counter enabling.
Note that the actual counter enable signal CNT_EN is set one clock cycle after TIM_CEN.
Note:
When the STM32W108 enters debug mode and the ARM Cortex-M3 core is halted, the
counters continue to run normally.
Table 23.
Timer GPIO use
Signal (direction)
TIMxC1
(in or out)
TIMxC2
(in or out)
TIMxC3
(in or out)
TIMxC4
(in or out)
TIMxCLK
(in)
TIMxMSK
(in)
Timer 1
PB6
PB7
PA6
PA7
PB0
PB5
Timer 2
(TIM_REMAPCy = 0)
PA0
PA3
PA1
PA2
PB5
PB0
Timer 2
(TIM_REMAPCy = 1)
PB1
PB2
PB3
PB4
PB0
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