ia186em Innovasic Semiconductor Inc., ia186em Datasheet - Page 55

• Manufacturer Part Number: ia186em
• Description: 8-bit/16-bit Microcontrollers
• Manufacturer: Innovasic Semiconductor Inc.

IA186EM/IA188EM
8-Bit/16-Bit Microcontrollers
In power-save mode the baud rate generator divide factor must be re-programmed to compensate
for the change in clock rate.
4.23
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 20 Mbits/sec with a 40-MHz CPU clock.
The synchronous serial interface of the IA186EM/ IA188EM 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
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.
Error detection provided by parity, framing, or overrun errors
Hardware handshaking is achieved with the following selectable control signals:
– Clear to send (cts_n)
– Enable receiver request (enrx_n)
– Ready to send (rts_n)
– Ready to receive (rtr_n)
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
Synchronous Serial Port
Programmable I/O (PIO)
®
UNCONTROLLED WHEN PRINTED OR COPIED
Page 55 of 145
IA211050831-16
December 24, 2008
http://www.Innovasic.com
Customer Support:
Data Sheet
1-888-824-4184