STMicroelectronics STM32 Cortex-M3, Manual

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4.6 Serial Interface (USART)
1 Intro
2 Electrocardiogram ( Ecg ) Signals
The Electrocardiogram (
Ecg
)
•
Ecg
: electrical manifestation of heart activity recorded
from the body surface
•
monitoring of heart rate
The
Ecg
signal can be recorded fairly easily with surface
electrodes placed on the limbs and/or the chest, see pages 6 – 16
below.
Josef Goette 2 2009
The baud rate generator generates the internal clock for sending and receiving data. The serial
protocol is shown in Figure
4.7 (1 start bit, 8 data bits, 1 stop bit and 1 parity).
Figure 4.7: USART Serial Protocol
4.6.5 Pinning
USART1
Default
Wire GPIO Pin
CK PA8 41
TX PA9 42
RX PA10 43
CTS PA11 44
RTS PA12 45
Remapped
Wire GPIO Pin
CK - -
TX PB6 58
RX PB7 59
CTS - -
RTS - -
USART2
Default
Wire GPIO Pin
CTS PA0 14
RTS PA1 15
TX PA2 16
RX PA3 17
CK PA4 18
Remapped 7→ only on LQFP100!
Wire GPIO Pin
CTS PD3 -
RTS PD4 -
TX PD5 -
RX PD6 -
CK PD7 -
USART3
Default
Wire GPIO Pin
TX PB10 29
RX PB11 30
CK PB12 33
CTS PB13 34
RTS PB14 35
Remapped
Wire GPIO Pin
TX PC10 51
RX PC11 52
CK PC12 53
CTS - -
RTS - -
Lukas Kohler 31