Справочник Пользователя для Motorola MC68HC908MR16

Advance Information

MC68HC908MR16/MC68HC908MR32 — Rev. 4.0

298

Serial Communications Interface Module (SCI)

MOTOROLA

SCI control register 3 (SCC3):

•

Stores the ninth SCI data bit received and the ninth SCI data bit to 
be transmitted

•

Enables SCI receiver full (SCRF) 

•

Enables SCI transmitter empty (SCTE) 

•

Enables the following interrupts:

–

Receiver overrun interrupts

–

Noise error interrupts

–

Framing error interrupts

–

Parity error interrupts

R8 — Received Bit 8

When the SCI is receiving 9-bit characters, R8 is the read-only ninth 
bit (bit 8) of the received character. R8 is received at the same time 
that the SCDR receives the other eight bits.

When the SCI is receiving 8-bit characters, R8 is a copy of the eighth 
bit (bit 7). Reset has no effect on the R8 bit.

T8 — Transmitted Bit 8

When the SCI is transmitting 9-bit characters, T8 is the read/write 
ninth bit (bit 8) of the transmitted character. T8 is loaded into the 
transmit shift register at the same time that the SCDR is loaded into 
the transmit shift register. Reset has no effect on the T8 bit.

Address:

$003A

Bit  7

6

5

4

3

2

1

Bit  0

Read:

R8

T8

0

0

ORIE

NEIE

FEIE

PEIE

Write:

R

R

R

Reset:

U

U

0

0

0

0

0

0

R

= Reserved

U = Unaffected