HC05 datasheet(113/232 Pages) MOTOROLA

113 / 232 page

MC68HC05X16

Rev. 1

MOTOROLA

7-11

SERIAL COMMUNICATIONS INTERFACE

R8 — Receive data bit 8

This read-only bit is the ninth serial data bit received when the SCI system is conﬁgured for nine

data bit operation (M = 1). The most signiﬁcant bit (bit 8) of the received character is transferred

into this bit at the same time as the remaining eight bits (bits 0–7) are transferred from the serial

receive shift register to the SCI receive data register.

T8 — Transmit data bit 8

This read/write bit is the ninth data bit to be transmitted when the SCI system is conﬁgured for nine

data bit operation (M = 1). When the eight low order bits (bits 0–7) of a transmit character are

transferred from the SCI data register to the serial transmit shift register, this bit (bit 8) is transferred

to the ninth bit position of the shift register.

M — Mode (select character format)

The read/write M-bit controls the character length for both the transmitter and receiver at the same

time. The 9th data bit is most commonly used as an extra stop bit or it can also be used as a parity

bit (see Table 7-1).

1 (set)

–

Start bit, 9 data bits, 1 stop bit.

0 (clear) –

Start bit, 8 data bits, 1 stop bit.

WAKE — Wake-up mode select

This bit allows the user to select the method for receiver wake-up. The WAKE bit can be read or

written to any time. See Table 7-1.

1 (set)

–

Wake-up on address mark; if RWU is set, SCI will wake-up if the 8th

(if M=0) or the 9th (if M=1) bit received on the Rx line is set.

0 (clear) –

Wake-up on idle line; if RWU is set, SCI will wake-up after 11 (if M=0)

or 12 (if M=1) consecutive ‘1’s on the Rx line.

Table 7-1 Method of receiver wake-up

WAKE

Method of receiver wake-up

Detection of an idle line allows the next data type received to cause the receive

data register to ﬁll and produce an RDRF ﬂag.

Detection of a received one in the eighth data bit allows an RDRF ﬂag and

associated error ﬂags.

Detection of a received one in the ninth data bit allows an RDRF ﬂag and

associated error ﬂags.

x = Don’t care

111

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