Z86E3016PSG Datasheet, PDF (106/348 Pages) Zilog, Inc. – Z86E3016PSG

Z8 Family of Microcontrollers
User Manual
88
Special Functions
Special functions for Port 3 are defined by programming the Port 3 Mode
Register. By writing 0s in bit 6 through bit 1, lines P37–P30 are config-
ured as input/output pairs (see Figure 49). Table 17 shows available func-
tions for Port 3. The special functions indicated in the figure are discussed
in detail in their corresponding sections in this manual.
Port 3 input lines P33–P30 always function as interrupt requests regard-
less of the configuration specified in the Port 3 Mode Register.
Register F7h
Port 3 Mode Register
(Write-Only)
D7 D6 D5 D4 D3 D2 D1 D0
0 Port 2 Open-Drain
1 Port 2 Push–Pull
0 P31, P32 Digital Mode
1 P31, P32 Analog Mode
0 P32 = Input
P35 = Output
00 P33 = Input
01 P33 = Input
10 P33 = Input
0 P31 = Input
P34 = Output
P34 = DM
P34 = DM
P36 = Output
0 P30 = Input
1 P30 = Serial In
0 Party ON
1 Party OFF
Figure 49. Port 3 Mode Register Configuration
P37 = Output
P37 = Serial Out
I/O Ports
UM001602-0904