參數(shù)資料
型號: R5F212BASNFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQFP48
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁數(shù): 31/138頁
文件大?。?/td> 492K
代理商: R5F212BASNFP
213
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
The EUSART supports more serial frame formats than the standard USART interface:
Asynchonous frames
Standard bit level encoded
Manchester bit encoded
Synchronous frames
In this mode only the Standard bit level encoded is available
19.3
Serial Frames
A serial frame is defined to be one character of data bits with synchronization bits (start and stop
bits), and optionally a parity bit for error checking.
19.3.1
Frame Formats
The EUSART allows to receive and transmit serial frame with the following format:
1 start bit
5, 6, 7, 8, 9, 13, 14,15,16,17 data bits
data bits and start bit level encoded or Manchester encoded
data transmition MSB or LSB first (bit ordering)
no, even or odd parity bit
1 or 2 stop bits:
Stop bits insertion for transmition
Stop bits value read access in reception
The frame format used by the EUSART can be configured th rough the fo llowing
USART/EUSART registers:
UTxS3:0 and URxS3:0 (EUCSRA of EUSART register) select the number of data bits per
frame
UPM1:0 bits enable and set the type of parity bit (when configured in Manchester mode, the
parity should be fixed to none).
USBS (UCSRC register of USART) and EUSBS (EUCSRB register of EUSART) select the num-
ber of stop bits to be processed respectively by the transmiter and the receiver. The receiver
stores the two stop bit values when configured in Manchester mode. When configured in level
encoded mode, the second stop bit is ignored (behavior similar as the USART).
19.3.2
Parity Bit Calculation
The parity bit behavior is similar to the USART mode, except for the Manchester encoded mode,
where no parity bit can be inserted or detected (should be configured to none with the
UPM1:0
bits. The parity bit is calculated by doing an exclusive-or of all the data bits. If odd parity is used,
the result of the exclusive or is inverted. The relation between the parity bit and data bits is as
follows:
P
even
Parity bit using even parity
P
odd
Parity bit using odd parity
d
n
Data bit n of the character
If used, the parity bit is located between the last data bit and first stop bit of a serial frame.
P
even
d
n
1
d
3
d
2
d
1
d
0
P
odd
d
n
1
d
3
d
2
d
1
d
0
1
=
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