Intel 80C186EB Manual page 13

Pin Pin
Name Type
T0OUT O
T1OUT
T0IN I
T1IN
INT0 I
INT1
INT4
INT2 INTA0 I O
INT3 INTA1
P2 7 I O
P2 6
CTSO I
P2 4 CTS1
TXD0 O
P2 1 TXD1
RXD0 I O
P2 0 RXD1
P2 5 BCLK0 I A(L) A(E)
P2 2 BCLK1
P2 3 SINT1 O
NOTE
Pin names in parentheses apply to the 80C188EB 80L188EB
Table 3 Pin Descriptions (Continued)
Input Output
Type States
H(Q) Timer OUTput pins can be programmed to provide a
single clock or continuous waveform generation
R(1)
depending on the timer mode selected
P(Q)
A(L) Timer INput is used either as clock or control signals
depending on the timer mode selected
A(E)
A(E L) Maskable INTerrupt input will cause a vector to a
specific Type interrupt routine To allow interrupt
expansion INT0 and or INT1 can be used with
INTA0 and INTA1 to interface with an external slave
controller
A(E L) H(1) These pins provide a multiplexed function As inputs
they provide a maskable INTerrupt that will cause
R(Z)
the CPU to vector to a specific Type interrupt routine
P(1)
As outputs each is programmatically controlled to
provide an INTERRUPT ACKNOWLEDGE
handshake signal to allow interrupt expansion
A(L) H(X) BI-DIRECTIONAL open-drain Port pins
R(Z)
P(X)
A(L) Clear-To-Send input is used to prevent the
transmission of serial data on their respective TXD
signal pin CTS1 is multiplexed with an input only port
function
H(X) H(Q) Transmit Data output provides serial data
information TXD1 is multiplexed with an output only
R(1)
Port function During synchronous serial
P(X) P(Q)
communications TXD will function as a clock output
A(L) R(Z) Receive Data input accepts serial data information
RXD1 is multiplexed with an input only Port function
H(Q)
During synchronous serial communications RXD is
P(X)
bi-directional and will become an output for
transmission or data (TXD becomes the clock)
Baud CLocK input can be used as an alternate clock
source for each of the integrated serial channels
BCLKx is multiplexed with an input only Port function
and cannot exceed a clock rate greater than one-half
the operating frequency of the processor
H(X) H(Q) Serial INTerrupt output will go active to indicate
serial channel 1 requires service SINT1 is
R(0)
multiplexed with an output only Port function
P(X) P(X)
80C186EB 80C188EB 80L186EB 80L188EB
Description
13