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
文件頁數(shù): 150/198頁
文件大?。?/td> 2871K
代理商: STM32W108HBU7
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STM32W108CB, STM32W108HB
General-purpose input/outputs
Doc ID 16252 Rev 3
activity caused a wake event, but not which specific GPIO was responsible. Instead,
software should read the state of the GPIOs on waking to determine the cause of the event.
The register GPIO_WAKEFILT contains bits to enable digital filtering of the external wakeup
event sources: the GPIO pins, SC1 activity, SC2 activity, and IRQD. The digital filter
operates by taking samples based on the (nominal) 10 kHz RC oscillator. If three samples in
a row all have the same logic value, and this sampled logic value is different from the logic
value seen upon entering sleep, the filter outputs a wakeup event.
In order to use GPIO pins to wake the STM32W108 from deep sleep, the GPIO_WAKE bit in
the WAKE_SEL register must be set. Waking up from GPIO activity does not work with pins
configured for analog mode since the digital logic input is always set to 1 when in analog
mode. Refer to Section 6: System modules on page 33 for information on the STM32W108's
power management and sleep modes.
8.2
External interrupts
The STM32W108 can use up to four external interrupt sources (IRQA, IRQB, IRQC, and
IRQD), each with its own top level NVIC interrupt vector. Since these external interrupt
sources connect to the standard GPIO input path, an external interrupt pin may
simultaneously be used by a peripheral device or even configured as an output. Analog
mode is the only GPIO configuration that is not compatible with using a pin as an external
interrupt.
External interrupts have individual triggering and filtering options selected using the
registers GPIO_INTCFGA, GPIO_INTCFGB, GPIO_INTCFGC, and GPIO_INTCFGD. The
bit field GPIO_INTMOD of the GPIO_INTCFGx register enables IRQx's second level
interrupt and selects the triggering mode: 0 is disabled; 1 for rising edge; 2 for falling edge; 3
for both edges; 4 for active high level; 5 for active low level. The minimum width needed to
latch an unfiltered external interrupt in both level- and edge-triggered mode is 80 ns. With
the digital filter enabled (the GPIO_INTFILT bit in the GPIO_INTCFGx register is set), the
minimum width needed is 450 ns.
The register INT_GPIOFLAG is the second-level interrupt flag register that indicates
pending external interrupts. Writing 1 to a bit in the INT_GPIOFLAG register clears the flag
while writing 0 has no effect. If the interrupt is level-triggered, the flag bit is set again
immediately after being cleared if its input is still in the active state.
Two of the four external interrupts, IRQA and IRQB, have fixed pin assignments. The other
two external interrupts, IRQC and IRQD, can use any GPIO pin. The GPIO_IRQCSEL and
GPIO_IRQDSEL registers specify the GPIO pins assigned to IRQC and IRQD, respectively.
Table 9 shows how the GPIO_IRQCSEL and GPIO_IRQDSEL register values select the
GPIO pin used for the external interrupt.
Table 9.
IRQC/D GPIO selection
GPIO_IRQxSEL
GPIO
GPIO_IRQxSEL
GPIO
GPIO_IRQxSEL
GPIO
0
PA0
8
PB0
16
PC0
1
PA1
9
PB1
17
PC1
2
PA2
10
PB2
18
PC2
3
PA3
11
PB3
19
PC3
4
PA4
12
PB4
20
PC4
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