IA186ER/IA188ER
Data Sheet
16-Bit/8-Bit Microcontrollers with RAM
February 25, 2013
The following features are supported:
Full-duplex data transfers
7- or 8-bit data transfers
Odd, even, or no parity
One or two stop bits
Error detection provided by parity, framing, or overrun errors
DMA to and from the port
The port has its own maskable interrupt
The port has an independent baud-rate generator
Maximum baud rate is 1/32 of the processor clock
Transmit and receive lines are double-buffered
In power-save mode the baud rate generator divide factor must be re-programmed to compensate
for the change in clock rate.
4.23 Synchronous Serial Port
The synchronous serial port allows the microcontrollers to communicate with ASICs that are
required to be programmed but have a pin shortage. The four-pin interface allows half-duplex,
bi-directional data transfer at a maximum of 25 Mbits/sec.
The synchronous serial interface of the IA186ER/ IA188ER operates as the master port in a
master/slave arrangement.
There are four pins in the synchronous serial interface for communication with the system
elements. These pins are two enables (SDEN0 and SDEN1), a clock (SCLK), and a data pin
(SDATA).
In power-save mode, the baud rate generator divide factor must be re-programmed to
compensate for the change in clock rate.
4.24 Programmable I/O (PIO)
Thirty-two pins are programmable as I/O signals (PIO). Table 15 presents them in both numeric
and alphabetic order. Because programming a pin as a PIO disables its normal function, it
should be done only if the normal function is not required. A PIO pin can be programmed as an
input or output with or without a weak pull-up or pull-down. A PIO pin can be also programmed
as an open-drain output. Each PIO pin regains default status after a POR.
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