S80C188EB13 INNOVASIC [InnovASIC, Inc], S80C188EB13 Datasheet - Page 35

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

IA186EB/IA188EB
8-Bit/16-Bit Microcontrollers
Table 8. IA188EB Pin/Signal Descriptions (Continued)
cts0_n
cts1_n
Signal
den_n
clkout
dt/r_n
bclk1
clkin
p2.4/cts1_n
p2.2/bclk1
cts0_n
den_n
Name
clkout
dt/r_n
clkin
PLCC
59
41
44
51
56
11
16
Pin
LQFP
NA
46
28
31
38
43
80
UNCONTROLLED WHEN PRINTED OR COPIED
PQFP
NA
71
74
43
9
1
6
Page 35 of 85
IA211080314-13
baud clock, Serial Port 1. Input. The bclk1 pin
can be used to provide an alternate clock
source for Serial Port 1. The input clock rate
cannot be greater than one-half the operating
frequency of the IA188EB.
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 IA188EB.
clock output. Output. The clkout pin provides
a timing reference for inputs and outputs of the
IA188EB. 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 are 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.
Description
http://www.Innovasic.com
Customer Support:
July 10, 2011
Data Sheet
1-888-824-4184