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參數(shù)資料
| 型號(hào)： | STM32W108HBU7 |
| 廠(chǎng)商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 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)： | 174/198頁(yè) |
| 文件大?。?/td> | 2871K |
| 代理商： | STM32W108HBU7 |
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STM32W108CB, STM32W108HB
Serial interfaces
Doc ID 16252 Rev 3
To initiate (re)start and stop segments, set the SC_TWISTART or SC_TWISTOP bit in the
SCx_TWICTRL1 register, then wait until the bit is clear. Alternatively, the SC_TWICMDFIN
bit in the SCx_TWISTAT can be used for waiting.
To initiate a transmit segment, write the data to the SCx_DATA data register, then set the
SC_TWISEND bit in the SCx_TWICTRL1 register, and finally wait until the bit is clear.
Alternatively the SC_TWITXFIN bit in the SCx_TWISTAT register can be used for waiting.
To initiate a receive segment, set the SC_TWIRECV bit in the SCx_TWICTRL1 register, wait
until it is clear, and then read from the SCx_DATA register. Alternatively, the SC_TWIRXFIN
bit in the SCx_TWISTAT register can be used for waiting. Now the SC_TWIRXNAK bit in the
SCx_TWISTAT register indicates if a NACK or ACK was received from a TWI slave device.
9.5.3
Interrupts
TWI master controller interrupts are generated on the following events:
●
Bus command (SC_TWISTART/SC_TWISTOP) completed (0 to 1 transition of
SC_TWICMDFIN)
●
Character transmitted and slave device responded with NACK
●
Character transmitted (0 to 1 transition of SC_TWITXFIN)
●
Character received (0 to 1 transition of SC_TWIRXFIN)
●
Received and lost character while receive FIFO was full (receive overrun error)
●
Transmitted character while transmit FIFO was empty (transmit underrun error)
To enable CPU interrupts, set the desired interrupt bits in the second level INT_SCxCFG
register, and enable the top level SCx interrupt in the NVIC by writing the INT_SCx bit in the
INT_CFGSET register.
9.6
Universal asynchronous receiver / transmitter (UART)
The SC1 UART is enabled by writing 1 to SC1_MODE. The SC2 serial controller does not
include UART functions.
The UART supports the following features:
●
Flexible baud rate clock (300 bps to 921.6 bps)
●
Data bits (7 or 8)
●
Parity bits (none, odd, or even)
●
Stop bits (1 or 2)
●
False start bit and noise filtering
●
Receive and transmit FIFOs
●
Optional RTS/CTS flow control
●
Receive and transmit DMA channels
The UART uses two signals to transmit and receive serial data:
●
TXD (Transmitted Data) - serial data received by the STM32W108
●
RXD (Received Data) - serial data sent by the STM32W108
If RTS/CTS flow control is enabled, these two signals are also used:
●
nRTS (Request To Send) - indicates the STM32W108 is able to receive data RXD
●
nCTS (Clear To Send) - inhibits sending data from the STM32W108 if not asserted
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