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2.5.1
I/O Ports
The 8XC196Kx, 8XC196Jx, and 87C196CA have seven I/O ports, ports 0–6. Individual port pins
are multiplexed to serve as standard I/O or to carry special-function signals associated with an
on-chip peripheral or an off-chip component. If a particular special-function signal is not used in
an application, the associated pin can be individually configured to serve as a standard I/O pin.
Ports 3 and 4 are exceptions. Their pins must be configured either as all I/O or as all address/data.
Port 0 is an input-only port that is also the analog input for the A/D converter. Ports 1, 2, and 6
are standard, bidirectional I/O ports. Port 1 provides pins for the EPA and timers. Port 2 provides
pins for the serial I/O (SIO) port, interrupts, bus control signals, and clock generator. Port 6 pro-
vides pins for the event processor array (EPA) and synchronous serial I/O (SSIO) port.
Ports 3, 4, and 5 are memory-mapped, bidirectional I/O ports. Ports 3 and 4 serve as the external
address/data bus. Port 5 provides bus control signals; for the 8XC196Kx, it can also provide pins
for the slave port. Chapter 6, "I/O Ports," describes the I/O ports in more detail.
The 87C196CA device does not implement the following port pins: P0.1:0,
P1.7:4, P2.5 and P2.3, P5.7 and P5.1, and P6.3:2. See "Design Considerations
for 87C196CA Devices" on page 2-13 for details.
The 8XC196Jx devices do not implement the following port pins: P0.1:0,
P1.7:4, P2.5 and P2.3, P5.7:4, and P6.3:2. See "Design Considerations for
8XC196JQ, JR, JT, and JV Devices" on page 2-14 for details.
2.5.2
Serial I/O (SIO) Port
The serial I/O (SIO) port is an asynchronous/synchronous port that includes a universal asynchro-
nous receiver and transmitter (UART). The UART has one synchronous mode (mode 0) and three
asynchronous modes (modes 1, 2, and 3) for both transmission and reception. The asynchronous
modes are full duplex, meaning that they can transmit and receive data simultaneously. The re-
ceiver is buffered, so the reception of a second byte may begin before the first byte is read. The
transmitter is also buffered, allowing continuous transmissions. See Chapter 7, "Serial I/O (SIO)
Port," for details.
2.5.3
Synchronous Serial I/O (SSIO) Port
The synchronous serial I/O (SSIO) port provides for simultaneous, bidirectional communications
between two 8XC196 family devices or between an 8XC196 device and another synchronous se-
rial I/O device. The SSIO port consists of two identical transceiver channels with a dedicated
baud-rate generator. The channels can be programmed to operate in several modes. See Chapter
8, "Synchronous Serial I/O (SSIO) Port," for more information.
ARCHITECTURAL OVERVIEW
NOTE
2-9
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