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Port Definitions
80
PRELIMINARY V1.8
To use P3.3/TXEN and P3.4/MODOUT as a special output port, PCR3 should be high.
And, a special output should be enabled in each block.
To use P3.6/NWR and P3.7/NRD as External Memory Read and Write Pins, PCR3
should be low. And, P3IO.6, P3IO.7, P3.6, and P3.7 latch should be high. To use P3.6/
NWR and P3.7/NRD as normal Port Pins, don’t use MOVX instructions that access
External Data Memory.
When P3NOPNx = 0, Port-3.x output buffer will be CMOS Push-Pull. But, P3NOPNx
= 1, Port-3.x output buffer will become N-channel Open Drain.
Figure 27.
Port 3
Address
B0H
Bit Addr.
B7H
B6H
B5H
B4H
B3H
B2H
B1H
B0H
BIT
7
6
5
4
3
2
1
0
NAME
P37
P36
P35
P34
P33
P32
P31
P30
MUX
0
1
SFR
P3
[7:0]
Pin
SFR
P3RD
[7:0]
To
CPU
MUX
Read-Modify-Write
R
PMOS
VDD
or
Output Enable
NHIZ
TXEN, MODOUT
TXENOE, MODOUTOE
CPTRU2, CPTRU1, CPTRD1, DI, IRQ1, IRQ2
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