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SDIAG1-SDIAGO - Serial Interface Diagnostic Mode
00 =Normal operation
01 =Automatic echo
The channel automatically retransmits the received data on a bit-
by-bit basis. The receiver operates normally, but the transmitter can
only retransmit received data. In this mode, L 1GR is ignored.
10= Internal loopback
The transmitter output (L 1TXD) is internally connected to the re-
ceiver input (L 1 RXD). The receiver and the transmitter operate nor-
mally. Transmitted data appears on the L 1TXD pin, and any external
data received on L 1 RXD pin is ignored. In this mode, L 1 RO is asserted
normally, and L 1GR is ignored.
11 = Loopback control
In this mode, the transmitter output is internally connected to the
receiver input. All the SCC transmitter outputs (TXD1/L 1TXD, TXD2,
TXD3) will be high and their RTS lines will be negated. L TXD will
be three-stated in IDL and PCM modes. This mode is used to ac-
complish SCC loopback testing without affecting pins in either NMSI
modes or multiplexed modes.
SDC2 -
Serial Data Strobe Control 2
1 = SDS2 signal is asserted during the 82 channel
0 = SDS1 signal is asserted during the 82 channel
SDC1 -
Serial Data Strobe Control 1
1 =SDS1 signal is asserted during the 81 channel
0 = SDS2 signal is asserted during the 81 channel
82R8, 82RA -
82 Channel Route in IDL/GCI Mode or CH-3 Route in PCM
MnrlP
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)
81R8, 81RA -
81 Channel Route in IDL/GCI Mode or CH-2 Route in PCM
MOTOROLA
Mode
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)
MC68302 USER'S MANUAL
4-15
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