IA188EBPLC84IR2 Datasheet, PDF (35/85 Pages) InnovASIC, Inc – 8-Bit/16-Bit Microcontrollers

IA186EB/IA188EB
8-Bit/16-Bit Microcontrollers
Data Sheet
July 10, 2011
Table 8. IA188EB Pin/Signal Descriptions (Continued)
Signal
bclk1
clkin
Name
p2.2/bclk1
clkin
Pin
PLCC LQFP
59
46
41
28
PQFP
9
71
Description
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.
clkout
clkout
44
31
74 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.
cts0_n
cts0_n
51
38
1 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.
cts1_n p2.4/cts1_n 56
43
6 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.
den_n
den_n
11
80
43 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.
dt/r_n
dt/r_n
16
NA
NA 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.
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