S80C188EB13 INNOVASIC [InnovASIC, Inc], S80C188EB13 Datasheet - Page 27

• Manufacturer Part Number: S80C188EB13
• Description: 8-Bit/16-Bit Microcontrollers
• Manufacturer: INNOVASIC [InnovASIC, Inc]

IA186EB/IA188EB
8-Bit/16-Bit Microcontrollers
Table 7. IA186EB Pin/Signal Descriptions (Continued)
error_n
cts0_n
cts1_n
Signal
den_n
clkout
dt/r_n
clkin
p2.4/cts1_n
error_n
cts0_n
den_n
Name
clkout
dt/r_n
clkin
PLCC
41
44
51
56
11
16
3
Pin
LQFP
NA
NA
28
31
38
43
80
UNCONTROLLED WHEN PRINTED OR COPIED
PQFP
NA
NA
71
74
43
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IA211080314-13
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clock input. Input. The clkin pin is the input
connection for an external clock. An external
oscillator operating at two times the required
processor operating frequency can be
connected to this pin.
If a crystal is used to supply the clock, it is
connected between the clkin pin and the
oscout pin (see oscout table entry). When a
crystal is connected, it drives an internal Pierce
oscillator to the IA186EB.
clock output. Output. The clkout pin provides
a timing reference for inputs and outputs of the
IA186EB. This clock output is one-half the
input clock (clkin) frequency. The clkout
signal has a 50% duty cycle, transitioning every
falling edge of clkin.
clear to send, Serial Port 0. Input. Active Low.
When this input is high (i.e., not asserted), data
transmission from Serial Port 0 is inhibited.
When the signal is asserted (low), data
transmission is permitted.
clear to send, Serial Port 1. Input. Active Low.
When this input is high (i.e., not asserted), data
transmission from Serial Port 1 is inhibited.
When the signal is asserted (low), data
transmission is permitted.
data enable. Output. Active Low. This signal
is used to enable of bidirectional transceivers in
a buffered system. The den_n signal is
asserted (low) only when data is to be
transferred on the bus.
data transmit/receive. Output. This signal is
used to control the direction of data flow for
bidirectional buffers in a buffered system.
When dt/r_n is high, the direction indicated is
transmit; when dt/t_n is low, the direction
indicated is receive.
error. Input. Active Low. When this signal is
asserted (low), it indicates that the last
numerics coprocessor operation resulted in an
exception condition.
Description
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Customer Support:
July 10, 2011
Data Sheet
1-888-824-4184