MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 141

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

SDC2—Serial Data Strobe Control 2
SDC1—Serial Data Strobe Control 1
B2RB, B2RA—B2 Channel Route in IDL/GCI Mode or CH-3 Route in PCM Mode
B1RB, B1RA—B1 Channel Route in IDL/GCI Mode or CH-2 Route in PCM Mode
DRB, DRA—D-Channel Route in IDL/GCI Mode or CH-1 Route in PCM Mode
MSC3—SCC3 Connection
MSC2—SCC2 Connection
MS1—MS0—Mode Supported
MOTOROLA
0 = SDS2 signal is asserted during the B2 channel
1 = SDS1 signal is asserted during the B2 channel
0 = SDS1 signal is asserted during the B1 channel
1 = SDS2 signal is asserted during the B1 channel
00 = Channel not supported
01 = Route channel to SCC1
10 = Route channel to SCC2 (if MSC2 is cleared)
11 = Route channel to SCC3 (if MSC3 is cleared)
00 = Channel not supported
01 = Route channel to SCC1
10 = Route channel to SCC2 (if MSC2 is cleared)
11 = Route channel to SCC3 (if MSC3 is cleared)
00 = Channel not supported
01 = Route channel to SCC1
10 = Route channel to SCC2 (if MSC2 is cleared)
11 = Route channel to SCC3 (if MSC3 is cleared)
0 = SCC3 is connected to the multiplexed serial interface (PCM, IDL, or GCI) chosen
1 = SCC3 is not connected to a multiplexed serial interface but is connected directly to
0 = SCC2 is connected to the multiplexed serial interface (PCM, IDL, or GCI) chosen
1 = SCC2 is not connected to a multiplexed serial interface but is either connected di-
00 = NMSI Mode
in MS1–MS0. NMSI3 pins are all available for other purposes.
the NMSI3 pins or SCP pins or is not used. The choice of general-purpose I/O port
pins versus SCC3 functions is made in the port A control register. The choice of
SCP pins versus SCC3 functions is made in the SPMODE register.
in MS1–MS0. NMSI2 pins are all available for other purposes.
rectly to the NMSI2 pins or not used. The choice of general-purpose I/O port pins
versus SCC2 functions is made in the port A control register.
When working in NMSI mode, SCC1 is connected directly to the seven NMSI1
pins (RXD1, TXD1, RCLK1, TCLK1, CD1, CTS1, and RTS1). SCC2 functions can
be routed to port A as NMSI functions or configured instead as PA6–PA0. Four of
the SCC3 functions can be routed to port A or retained as PA11–PA8. The other
MC68302 USER’S MANUAL
Communications Processor (CP)
4-21