Intel 386 User Manual
Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
9-18
9.3.1
Port 3 Configuration Register (P3CFG)
Use the P3CFG register to connect the interrupt request signals (INT3:0) to the package pins.
These signals are multiplexed with port 3 signals, P3.5–2. Connecting a port 3 signal to the pack-
age pin also connects V
These signals are multiplexed with port 3 signals, P3.5–2. Connecting a port 3 signal to the pack-
age pin also connects V
SS
to the corresponding master’s IR signal, disabling the signal.
Figure 9-6. Port 3 Configuration Register (P3CFG)
Port 3 Configuration
P3CFG
(read/write)
P3CFG
(read/write)
Expanded Addr:
ISA Addr:
Reset State:
ISA Addr:
Reset State:
F824H
—
00H
—
00H
7
0
PM7
PM6
PM5
PM4
PM3
PM2
PM1
PM0
Bit
Number
Bit
Mnemonic
Function
7
PM7
Pin Mode:
0 = Selects P3.7 at the package pin.
1 = Selects COMCLK at the package pin.
1 = Selects COMCLK at the package pin.
6
PM6
Pin Mode:
0 = Selects P3.6 at the package pin.
1 = Selects PWRDOWN at the package pin.
1 = Selects PWRDOWN at the package pin.
5
PM5
Pin Mode:
0 = Selects P3.5 at the package pin.
1 = Connects master IR7 to the package pin (INT3).
1 = Connects master IR7 to the package pin (INT3).
4
PM4
Pin Mode:
0 = Selects P3.4 at the package pin.
1 = Connects master IR6 to the package pin (INT2).
1 = Connects master IR6 to the package pin (INT2).
3
PM3
Pin Mode:
0 = Selects P3.3 at the package pin.
1 = Connects master IR5 to the package pin (INT1).
1 = Connects master IR5 to the package pin (INT1).
2
PM2
Pin Mode:
0 = Selects P3.2 at the package pin.
1 = Connects master IR1 to the package pin (INT0).
1 = Connects master IR1 to the package pin (INT0).
1
PM1
Pin Mode:
See Table 5-1 on page 5-8 for all the PM1 configuration options.
0
PM0
Pin Mode:
See Table 5-1 on page 5-8 for all the PM0 configuration options.