80C186EC Datasheet, PDF (14/57 Pages) Intel Corporation – 16-BIT HIGH-INTEGRATION EMBEDDED PROCESSORS

80C186EC 188EC 80L186EC 188EC
Pin Name
P3 1 TXI1
P3 0 RXI1
WDTOUT
P2 7 CTS1
P2 3 CTS0
P2 6 BCLK1
P2 2 BCLK0
P2 5 TXD1
P2 1 TXD0
P2 4 RXD1
P2 0 RXD0
DRQ3 0
Pin
Type
O
O
O
IO
IO
IO
IO
I
Input
Type
A(L)
A(L)
A(E)
A(L)
A(L)
A(L)
Table 2 Pin Descriptions (Continued)
Output
States
Pin Description
H(X) H(Q)
R(0)
I(Q)
P(X)
Transmit Interrupt output goes active to indicate that
serial channel 1 has completed a transfer TXI1 is
multiplexed with an output only Port function
H(X) H(Q)
R(0)
I(Q)
P(X)
Receive Interrupt output goes active to indicate that
serial channel 1 has completed a reception RXI1 is
multiplexed with an output only port function
H(Q)
R(1)
I(Q)
P(X)
WatchDog Timer OUTput is driven low for four clock
cycles when the watchdog timer reaches zero WDTOUT
may be ANDed with the power-on reset signal to reset the
processor when the watchdog timer is not properly reset
H(X)
R(Z)
I(X)
P(X)
Clear-To-Send input is used to prevent the transmission
of serial data on the TXD signal pin CTS1 and CTS0 are
multiplexed with an I O Port function
H(X)
R(Z)
I(X)
P(X)
Baud CLocK input can be used as an alternate clock
source for each of the integrated serial channels The
BCLK inputs are multiplexed with I O Port functions The
BCLK input frequency cannot exceed the operating
frequency of the processor
H(Q)
R(Z)
I(X) I(Q)
P(X)
Transmit Data output provides serial data information
The TXD outputs are multiplexed with I O Port functions
During synchronous serial communications TXD will
function as a clock output
H(X) H(Q)
R(Z)
I(X) I(Q)
P(X)
Receive Data input accepts serial data information The
RXD pins are multiplexed with I O Port functions During
synchronous serial communications RXD is bi-directional
and will become an output for transmission of data (TXD
becomes the clock)
DMA ReQuest input pins are used to request a DMA
transfer The timing of the request is dependent on the
programmed synchronization mode
NOTES
1 READY is A(E) for the rising edge of CLKOUT S(E) for the falling edge of CLKOUT
2 Pin names in parentheses apply to the 80C188EC 80L188EC
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