
TABLE OF CONTENTS
vi
EPSON
III-7 CLOCK TIMER ...............................................................................................B-III-7-1
Configuration of Clock Timer.........................................................................................................................B-III-7-1
Control and Operation of the Clock Timer ...............................................................................................B-III-7-2
Interrupt Function ..............................................................................................................................................B-III-7-4
Examples of Use of Clock Timer .................................................................................................................B-III-7-6
I/O Memory of Clock Timer............................................................................................................................B-III-7-7
Programming Notes.......................................................................................................................................B-III-7-12
III-8 SERIAL INTERFACE ......................................................................................B-III-8-1
Configuration of Serial Interfaces ................................................................................................................B-III-8-1
Features of Serial Interfaces...........................................................................................................B-III-8-1
I/O Pins of Serial Interface .............................................................................................................................B-III-8-2
Setting Transfer Mode ......................................................................................................................B-III-8-3
Clock-Synchronized Interface.......................................................................................................................B-III-8-4
Outline of Clock-Synchronized Interface....................................................................................B-III-8-4
Setting Clock-Synchronized Interface.........................................................................................B-III-8-5
Control and Operation of Clock-Synchronized Transfer......................................................B-III-8-7
Asynchronous Interface ...............................................................................................................................B-III-8-12
Outline of Asynchronous Interface ............................................................................................B-III-8-12
Setting Asynchronous Interface .................................................................................................B-III-8-13
Control and Operation of Asynchronous Transfer...............................................................B-III-8-16
IrDA Interface ...................................................................................................................................................B-III-8-20
Outline of IrDA Interface ................................................................................................................B-III-8-20
Setting IrDA Interface .....................................................................................................................B-III-8-20
Control and Operation of IrDA Interface..................................................................................B-III-8-22
Serial Interface Interrupts and DMA........................................................................................................B-III-8-23
I/O Memory of Serial Interface...................................................................................................................B-III-8-26
Programming Notes.......................................................................................................................................B-III-8-37
III-9 INPUT/OUTPUT PORTS .................................................................................B-III-9-1
Input Ports (K Ports).........................................................................................................................................B-III-9-1
Structure of Input Port.......................................................................................................................B-III-9-1
Input-Port Pins .....................................................................................................................................B-III-9-1
Notes on Use........................................................................................................................................B-III-9-2
I/O Memory of Input Ports ...............................................................................................................B-III-9-3
I/O Ports (P Ports).............................................................................................................................................B-III-9-4
Structure of I/O Port...........................................................................................................................B-III-9-4
I/O Port Pins .........................................................................................................................................B-III-9-4
I/O Control Register and I/O Modes............................................................................................B-III-9-5
I/O Memory of I/O Ports ...................................................................................................................B-III-9-6
Input Interrupt ...................................................................................................................................................B-III-9-10
Port Input Interrupt ...........................................................................................................................B-III-9-10
Key Input Interrupt............................................................................................................................B-III-9-12
Control Registers of the Interrupt Controller...........................................................................B-III-9-14
I/O Memory for Input Interrupts ...................................................................................................B-III-9-16
Programming Notes........................................................................................................................................B-III-9-22