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Send break. 2 Data Format Receive data or transmit data is the serial data which is transferred to the internal data bus from the receive data input pin (RxD), or from the internal bus to the transmit data output pin (TxD). The non-return-to-zero (NRZ) data format shown in Figure 5-1 is used and must meet the following criteria: MC68HC11A8 TECHNICAL DATA SERIAL COMMUNICATIONS INTERFACE MOTOROLA 5-1 5 1. The idle line is brought to a logic one state prior to transmission/reception of a character.

In the single-chip operating mode, internal ROM is enabled regardless of the state of the ROMON bit. There is also a 192 byte mask programmed boot ROM in the MC68HC11A8. This bootstrap program ROM controls the operation of the special bootstrap operating mode and is only enabled following reset in the special bootstrap operating mode. 3 Special Bootstrap Operating Mode. 4 RAM The 256 byte internal RAM may be relocated during initialization by writing to the INIT register. The reset default position is $0000 through $00FF.

102D RESET 7 TIE 0 6 TCIE 0 5 RIE 0 4 ILIE 0 3 TE 0 2 RE 0 1 RWU 0 0 SBK 0 SCCR2 TIE — Transmit Interrupt Enable 0 = TDRE interrupts disabled 1 = SCI interrupt if TDRE = 1 MOTOROLA 5-8 SERIAL COMMUNICATIONS INTERFACE MC68HC11A8 TECHNICAL DATA TCIE — Transmit Complete Interrupt Enable 0 = TC interrupts disabled 1 = SCI Interrupt if TC = 1 RIE — Receive Interrupt Enable 0 = RDRF and OR interrupts disabled 1 = SCI interrupt if RDRF or OR = 1 ILIE — Idle Line Interrupt Enable 0 = IDLE interrupts disabled 1 = SCI interrupt if IDLE = 1 TE — Transmit Enable When the transmit enable bit is set, the transmit shift register output is applied to the TxD line.

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