MC68306 Motorola, MC68306 Datasheet - Page 143

• Manufacturer Part Number: MC68306
• Description: Integrated EC000 Processor
• Manufacturer: Motorola

OPCR3–OPCR2—Output Port 3 Function Select
OPCR1–OPCR0—Output Port 2 Function Select
MOTOROLA
00 = OPR bit 3
01 = Counter/timer output
10 = TxCB (1X)
11 = RxCB (1X)
00 = OPR bit 2
01 = TxCA (16X)
10 = TxCA (1X)
11 = RxCA (1X)
OP bits 7, 6, 5, 4, and 2 are not pinned out on the MC68306;
thus changing bits 7, 6, 5, 4, 1, and 0 of this register has no
effect.
OP3 is open-drain in this mode, and an external pullup is
required.
DUOPCR
Write Only
T≈RDYB
RESET:
OP7
7
0
T≈RDYA
OP6
6
0
MC68306 USER'S MANUAL
R≈RDYB
OP5
5
0
R≈RDYA
OP4
4
0
NOTE
NOTE
3
0
OP3
2
0
1
0
OP2
0
0
6-35