Datasheet

815
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
36.8.21 USART Manchester Configuration Register
Name: US_MAN
Address: 0x40024050 (0), 0x40028050 (1)
Access: Read/Write
This register can only be written if the WPEN bit is cleared in “USART Write Protection Mode Register” on page 817.
• TX_PL: Transmitter Preamble Length
0: The transmitter preamble pattern generation is disabled
1–15: The preamble length is TX_PL x Bit Period
• TX_PP: Transmitter Preamble Pattern
The following values assume that TX_MPOL field is not set:
• TX_MPOL: Transmitter Manchester Polarity
0: Logic zero is coded as a zero-to-one transition, Logic one is coded as a one-to-zero transition.
1: Logic zero is coded as a one-to-zero transition, Logic one is coded as a zero-to-one transition.
• RX_PL: Receiver Preamble Length
0: The receiver preamble pattern detection is disabled
1–15: The detected preamble length is RX_PL x Bit Period
31 30 29 28 27 26 25 24
– DRIFT ONE RX_MPOL – – RX_PP
23 22 21 20 19 18 17 16
–––– RX_PL
15 14 13 12 11 10 9 8
– – – TX_MPOL – – TX_PP
76543210
––––
TX_PL
Value Name Description
0 ALL_ONE The preamble is composed of ‘1’s
1 ALL_ZERO The preamble is composed of ‘0’s
2 ZERO_ONE The preamble is composed of ‘01’s
3 ONE_ZERO The preamble is composed of ‘10’s