ia186es Innovasic Semiconductor Inc., ia186es Datasheet - Page 87

• Manufacturer Part Number: ia186es
• Description: 8-bit/16-bit Microcontrollers
• Manufacturer: Innovasic Semiconductor Inc.

IA186ES/IA188ES
8-Bit/16-Bit Microcontrollers
5.1.27 PDATA1 (07ah) and PDATA0 (074h)
PIO DATA Registers. When a PIO pin is configured as an output, the value in the
corresponding PIO data register bit is driven onto the pin. However, if the PIO pin is configured
Serial Port MODE Settings
a
been implemented to provide 2 stop bits.
– Mode 2 requires that the ninth data is set to a 1 state. Otherwise, the character will be
– This is designed to facilitate multidrop communication over a common serial data
– Handshaking should only be employed in such a multidrop system by ports that are
– Mode 3 allows for 8 data bits if parity is enabled or 9 data bits if parity is not enabled.
– Mode 4 allows for a start bit, 7 data bits, and a stop bit without parity, which is not
These were originally reserved modes that have
MODE
0
1
2
3
4
5
6
7
a
a
a
a
ignored by the receiver. The transmit section, however, operates as if it were in
Mode 3.
link. For this purpose, the port in question is initially programmed to mode 2 and for
each data received with the ninth bit (Bit [8]) set as 1. It is compared by software
with a unique identifier for this port. If the identifier comparison does not find a
match, the port is left in mode 2. If the comparison finds an identifier match, the port
should be reprogrammed to mode 3 so that the ninth bit is allowed to be 0.
exchanging data (mode 3) to prevent multiple ports from attempting to drive the
handshake signals. Mode 2 does not support handshaking for this reason and should
not be enabled. If it is possible that more than 2 ports be configured in mode 3 at the
same time, handshaking should not be implemented.
If parity is not used, the ninth data bit for the transmit section is set by writing a 1 to
the TB8 bit in the serial port control register. The ninth bit is read at the receive port
from the RB8 bit in the serial port status register.
available.
Data Mode 0
Data Mode 1
Data Mode 2
Data Mode 3
Data Mode 4
Data Mode 5
Data Mode 6
Data Mode 7
Description
®
7 or 8
8 or 9
7 or 8
8 or 9
Data
Bits
7
9
7
9
UNCONTROLLED WHEN PRINTED OR COPIED
Parity
1 or 0
1 or 0
1 or 0
1 or 0
Bits
–
–
–
0
Page 87 of 154
IA211050902-15
Stop
Bits
2
1
1
1
1
2
2
2
December 24, 2008
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