Datasheet

&3,
Data Sheet 7 1999-07
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P3
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
P3.8
P3.9
P3.10
P3.11
P3.12
P3.13
P3.15
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
IO
I/O
I/O
I
O
I
I
I
I
I/O
I/O
O
I/O
O
O
I/O
O
O
Port 3 is a 15-bit bidirectional I/O port. It is bit-wise
programmable for input or output via direction bits. For
a pin configured as input, the output driver is put into
high-impedance state. Port 3 outputs can be
configured as push/pull or open drain drivers. The input
threshold of Port 3 is selectable (TTL or special). The
following Port 3 pins also serve for alternate functions:
SCL0 I2C Bus Clock Line 0
SDA0 I2C Bus Data Line 0
CAPIN GPT2 Register CAPREL Capture Input
T3OUT GPT1 Timer T3 Toggle Latch Output
T3EUD GPT1 Timer T3 External Up/Down Ctrl.Inp
T4IN GPT1 Timer T4 Count/Gate/Reload/
Capture Input
T3IN GPT1 Timer T3 Count/Gate Input
T2IN GPT1 Timer T2 Count/Gate/Reload/
Capture Input
MRST SSC Master-Rec. / Slave-Trans. Inp/Outp.
MTSR SSC Master-Trans. / Slave-Rec. Outp/Inp.
T×D0 ASC0 Clock/Data Output (Async./Sync.)
R×D0 ASC0 Data Input (Async.) or I/O (Sync.)
BHE
External Memory High Byte Enable Signal,
WRH
External Memory High Byte Write Strobe
SCLK SSC Master Clock Outp. / Slave Clock Inp.
CLKOUT System Clock Output (=CPU Clock)
FOUT Programmable Frequency Output
Note: Pins P3.0 and P3.1 are open drain outputs only.
Table 1 Pin Definitions and Functions (continued)
Symbol Pin
Num.
TQFP
Pin
Num.
MQFP
Input
Outp.
Function