IA186EB/IA188EB
Data Sheet
8-Bit/16-Bit Microcontrollers
July 10, 2011
Table 8. IA188EB Pin/Signal Descriptions (Continued)
Pin
Signal
rxd0
Name
rxd0
PLCC
53
LQFP
40
PQFP
3
Description
Receive (rx) data, Serial Port 0. Input/Output.
This pin is the serial data input for Serial Port 0.
During synchronous serial communications,
rxd0 is bidirectional and functions an output for
data transmission (txd0 becomes the clock).
rxd1
p2.0/rxd1
57
44
7
Receive (rx) data, Serial Port 1. Input/Output.
This pin is the serial data input for Serial Port 1.
During synchronous serial communications,
rxd1 is bidirectional and functions an output for
data transmission (txd1 becomes the clock).
s0_n
s1_n
s2_n
s0_n
s1_n
s2_n
10
9
79
78
77
42
41
40
statusN (N = 0–2). Output. During a bus cycle
the status (i.e., type) of cycle is encoded on
these lines as follows:
s2_n s1_n s0_n Bus Cycle Status
0
0
0
0
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Interrupt Acknowledge
Read I/O
Write I/O
Processor HALT
Queue Instruction Fetch
Read Memory
Write Memory
8
1
No Bus Activity
sint1
t0in
p2.3/sint1
t0in
55
46
45
42
33
32
5
serial interrupt, Serial Port 1. Output. Active
High. When sint1 is asserted (high), it
indicates that Serial Port 1 requires service.
timer 0 input. Input. Depending on the Timer
Mode programmed for Timer 0, this input is
used either as clock input or a control signal.
timer 0 output. Output. Depending on the
Timer Mode programmed for Timer 0, this
output can provide a single clock or a
continuous waveform.
76
75
t0out
t0out
t1in
t1in
48
47
35
34
78
77
timer 1 input. Input. Depending on the Timer
Mode programmed for Timer 1, this input is
used either as clock input or a control signal.
timer 1 output. Output. Depending on the
Timer Mode programmed for Timer 1, this
output can provide a single clock or a
continuous waveform.
t1out
t1out
IA211080314-13
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