Intel 8XC196MC User Manual page 9

8XC196MC, MD, MH USER'S MANUAL
5.6.6 Serial I/O Modes .....................................................................................................5-37
5.6.6.1 Synchronous SIO Transmit Mode Example .......................................................5-43
5.6.6.2 Synchronous SIO Receive Mode Example ........................................................5-47
5.6.6.3 Asynchronous SIO Transmit Mode Example .....................................................5-50
5.6.6.4 Asynchronous SIO Receive Mode Example ......................................................5-55
CHAPTER 6
I/O PORTS
6.1 I/O PORTS OVERVIEW ................................................................................................ 6-1
6.2 INPUT-ONLY PORTS 1 (MC, MD ONLY) AND 0.......................................................... 6-2
6.2.1 Standard Input-only Port Operation ..........................................................................6-3
6.2.2 Standard Input-only Port Considerations ..................................................................6-4
6.3 BIDIRECTIONAL PORTS 1 (MH ONLY), 2, 5, AND 7 (MD ONLY)............................... 6-4
6.3.1 Bidirectional Port Operation ......................................................................................6-6
6.3.2 Bidirectional Port Pin Configurations .........................................................................6-9
6.3.3 Bidirectional Port Pin Configuration Example .........................................................6-11
6.3.4 Bidirectional Port Considerations ............................................................................6-12
6.4 BIDIRECTIONAL PORTS 3 AND 4 (ADDRESS/DATA BUS)...................................... 6-14
6.4.1 Bidirectional Ports 3 and 4 (Address/Data Bus) Operation .....................................6-15
6.4.2 Using Ports 3 and 4 as I/O ......................................................................................6-16
6.4.3 Design Considerations for Ports 3 and 4 ................................................................6-16
6.5 STANDARD OUTPUT-ONLY PORT 6 ....................................................................... 6-16
6.5.1 Output-only Port Operation .....................................................................................6-17
6.5.2 Configuring Output-only Port Pins ..........................................................................6-17
CHAPTER 7
SERIAL I/O (SIO) PORT
7.1 SERIAL I/O (SIO) PORT FUNCTIONAL OVERVIEW ................................................... 7-1
7.2 SERIAL I/O PORT SIGNALS AND REGISTERS .......................................................... 7-2
7.3 SERIAL PORT MODES ................................................................................................. 7-4
7.3.1 Synchronous Modes (Modes 0 and 4) ......................................................................7-5
7.3.1.1 Mode 0 .................................................................................................................7-5
7.3.1.2 Mode 4 .................................................................................................................7-6
7.3.2 Asynchronous Modes (Modes 1, 2, and 3) ...............................................................7-7
7.3.2.1 Mode 1 .................................................................................................................7-7
7.3.2.2 Mode 2 .................................................................................................................7-8
7.3.2.3 Mode 3 .................................................................................................................7-9
7.3.2.4 Mode 2 and 3 Timings ..........................................................................................7-9
7.3.2.5 Multiprocessor Communications ..........................................................................7-9
7.4 PROGRAMMING THE SERIAL PORT ........................................................................ 7-10
7.4.1 Configuring the Serial Port Pins ..............................................................................7-10
7.4.2 Programming the Control Register ..........................................................................7-10
7.4.3 Programming the Baud Rate and Clock Source .....................................................7-12
7.4.4 Enabling the Serial Port Interrupts ..........................................................................7-14
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