Datasheet

871
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
39.8.25 USART Manchester Configuration Register
Name: US_MAN
Address: 0xF801C050 (0), 0xF8020050 (1), 0xF8024050 (2), 0xF8028050 (3)
Access: Read-write
This register can only be written if the WPEN bit is cleared in “USART Write Protect Mode Register” on page 877.
• 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
• RX_PP: Receiver Preamble Pattern detected
The following values assume that RX_MPOL field is not set:
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
00 ALL_ONE The preamble is composed of ‘1’s
01 ALL_ZERO The preamble is composed of ‘0’s
10 ZERO_ONE The preamble is composed of ‘01’s
11 ONE_ZERO The preamble is composed of ‘10’s
Value Name Description
00 ALL_ONE The preamble is composed of ‘1’s