Pin Description
Pin Definition
Pin Number
Type
Description
Pin Name
DIP-40
39
38
37
36
35
34
33
32
1
PLCC-44
PQFP-44
37
36
35
34
33
32
31
30
40
41
42
43
44
1
P0.0 (AD0)
P0.1 (AD1)
P0.2 (AD2)
P0.3 (AD3)
P0.4 (AD4)
P0.5 (AD5)
P0.6 (AD6)
P0.7 (AD7)
P1.0 (T2)
P1.1 (T2EX)
P1.2
43
42
41
40
39
38
37
36
2
B
Port0 is an open-drain, bi-directional IO port.
When 1s are written to Port0, they become
high-impedance inputs. Port0 is also multiplexed
with low-order address or data bus during
accesses to external program and data memory.
BU General-purposed I/O with weak pull-up
resistance inside. When 1s are written into Port1,
the strong output driving PMOS only turn-on two
clock periods and then the weak pull-up
resistance keep the port high.
2
3
3
4
P1.3
4
5
P1.4
5
6
P1.0 is also used as one of event sources for
timer2, or output carrier of timer2, alias T2.
P1.5
6
7
P1.6
7
8
2
P1.1 is also used as one of interrupt-controlling
sources for time2, alias T2EX.
P1.7
8
9
3
P2.0 (A8)
21
22
23
24
25
26
27
28
10
11
12
13
14
15
16
17
24
25
26
27
28
29
30
31
11
13
14
15
16
17
18
19
18
19
20
21
22
23
24
25
5
BU Port2 is an 8-bit bi-directional I/O port with pull-up
resistance. Except being as GPIO, Port2 emits
the high-order address byte during accessing to
external program and data memory.
P2.1 (A9)
P2.2 (A10)
P2.3 (A11)
P2.4 (A12)
P2.5 (A13)
P2.6 (A14)
P2.7 (A15)
P3.0 (RXD)
P3.1 (TXD)
P3.2 (INT0)
P3.3 (INT1)
P3.4 (T0)
BU General-purposed I/O with weak pull-up
resistance inside. When 1s are written into Port1,
the strong output driving PMOS only turn-on two
clock periods and then the weak pull-up
resistance keep the port high. Port3 also serves
other special functions of this device.
7
8
9
10
11
12
13
P3.5 (T1)
P3.0 and P3.1 act as receiver and transceiver of
the data for UART function block,
P3.6 (/WR)
P3.7 (/RD)
Alias RXD and TXD.
4
MPC89x515A Data Sheet
MEGAWIN
MEGAWIN [ MEGAWIN TECHNOLOGY CO., LTD ]
