MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 443

• Manufacturer Part Number: MC68000
• Manufacturer: MOTOROLA [Motorola, Inc]

UM1, UM0—UART Mode 1-0
FRZ—Freeze Transmission
CL—Character Length
RTSM—RTS Mode
SL—Stop Length
DIAG1, DIAG0—Diagnostic Mode
ENR—Enable Receiver
ENT—Enable Transmitter
MODE1, MODE0—Channel Mode
MOTOROLA
00 = Normal UART operation.
01 = Nonautomatic multidrop mode. No automatic address recognition is performed.
10 = DDCMP protocol is implemented over the asynchronous channel.
11 = Automatic multidrop mode. The IMP automatically checks the value of the incom-
0 = Normal operation.
1 = The IMP stops transmitting after transmitting any data already transferred to the
0 = 7-bit character length. On receive, bit 7 is written to memory as a zero.
1 = 8-bit character length.
0 = RTS is asserted whenever the transmitter is enabled and there are characters to
1 = RTS is asserted whenever the transmitter is enabled.
0 = One stop bit.
1 = Two stop bits.
00 = Normal operation.
01 = Loopback mode.
10 = Automatic echo.
11 = Software operation.
0 = Receiver is disabled.
1 = Receiver is enabled.
0 = Transmitter is disabled.
1 = Transmitter is enabled.
00 = HDLC.
01 = Asynchronous (UART and DDCMP).
10 = Synchronous DDCMP and V.110.
11 = BISYNC and Promiscuous (Transparent).
transmit FIFO.
transmit.
ing address character and accepts the data following it only if the address match-
es the 8-bit value in either UADDR1 or UADDR2.
MC68360 USER’S MANUAL
SCC Programming Reference
E-21