STMicroelectronics STM32WL5 Series Reference Manual page 37

Advanced arm-based 32-bit mcus with sub-ghz radio solution
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RM0453
35.8.1
35.8.2
35.8.3
35.8.4
35.8.5
35.8.6
35.8.7
35.8.8
35.8.9
35.8.10 USART interrupt and status register [alternate] (USART_ISR) . . . . . 1190
35.8.11 USART interrupt flag clear register (USART_ICR) . . . . . . . . . . . . . . 1195
35.8.12 USART receive data register (USART_RDR) . . . . . . . . . . . . . . . . . . 1197
35.8.13 USART transmit data register (USART_TDR) . . . . . . . . . . . . . . . . . . 1197
35.8.14 USART prescaler register (USART_PRESC) . . . . . . . . . . . . . . . . . . 1198
35.8.15 USART register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1199
36
Low-power universal asynchronous receiver
transmitter (LPUART) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1201
36.1
LPUART introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1201
36.2
LPUART main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1202
36.3
LPUART implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1203
36.4
LPUART functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1204
36.4.1
36.4.2
36.4.3
36.4.4
36.4.5
36.4.6
36.4.7
36.4.8
36.4.9
36.4.10 LPUART parity control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1218
36.4.11 LPUART single-wire Half-duplex communication . . . . . . . . . . . . . . . 1219
36.4.12 Continuous communication using DMA and LPUART . . . . . . . . . . . . 1219
36.4.13 RS232 Hardware flow control and RS485 Driver Enable . . . . . . . . . 1222
36.4.14 LPUART low-power management . . . . . . . . . . . . . . . . . . . . . . . . . . . 1224
36.5
LPUART in low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1227
USART control register 1 (USART_CR1) . . . . . . . . . . . . . . . . . . . . . 1165
USART control register 1 [alternate] (USART_CR1) . . . . . . . . . . . . . 1169
USART control register 2 (USART_CR2) . . . . . . . . . . . . . . . . . . . . . 1172
USART control register 3 (USART_CR3) . . . . . . . . . . . . . . . . . . . . . 1176
USART baud rate register (USART_BRR) . . . . . . . . . . . . . . . . . . . . 1181
USART guard time and prescaler register (USART_GTPR) . . . . . . . 1181
USART receiver timeout register (USART_RTOR) . . . . . . . . . . . . . . 1182
USART request register (USART_RQR) . . . . . . . . . . . . . . . . . . . . . . 1183
USART interrupt and status register (USART_ISR) . . . . . . . . . . . . . 1184
LPUART block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1204
LPUART signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1205
LPUART character description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1205
LPUART FIFOs and thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1206
LPUART transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1207
LPUART receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1210
LPUART baud rate generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1214
Tolerance of the LPUART receiver to clock deviation . . . . . . . . . . . . 1215
LPUART multiprocessor communication . . . . . . . . . . . . . . . . . . . . . . 1216
RM0453 Rev 5
Contents
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