MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 441

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

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
E.2.1.1.3 Serial Interface Mask Register (SIMASK). This 16-bit register is located at off-
set $8B2. The SIMASK register is used to configure which bits on the B1 and B2 channels
are used in the GCI and IDL modes. Bit 0 of SIMASK is the first bit transmitted and received
on B1.
E.2.1.2 PER SCC REGISTERS. Each of the three SCCs has a set of the following six reg-
isters. These registers configure the SCC and the protocol operation. Some parameters and
register bits are protocol independent. The UART functions have been given for those
parameters and bits that are protocol specific.
E.2.1.2.1 Serial Configuration Register (SCON). This 16-bit register is located at offset
$882 (SCC1), $892 (SCC2), and $8A2 (SCC3). The SCON register is used to select the
clock source and baud rate for the SCC.
WOMS—Wired-OR Mode Select
MOTOROLA
WOMS EXTC
15
15
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.
1 = SCC3 is not connected to the multiplexed serial interface.
0 = SCC2 is connected to the multiplexed serial interface.
1 = SCC2 is not connected to the multiplexed serial interface.
00 = NMSI mode.
01 = PCM mode.
10 = IDL mode.
11 = GCI interface.
0 = TXD driver operates normally.
1 = TXD driver functions as an open-drain output and may be wired together with other
14
TXD pins.
RCS
13
TCS
12
B2
CD10
11
CD9
10
MC68360 USER’S MANUAL
CD8
9
CD7
8
8
CD6
7
7
CD5
6
CD4
5
CD3
SCC Programming Reference
4
B1
CD2
3
CD1
2
CD0
1
DIV4
E-19
0
0