E0C88832/88862 TECHNICAL MANUAL
EPSON
i
CONTENTS
Contents
1
INTRODUCTION .............................................................................................. 1
1.1
Configuration ..................................................................................................................... 1
1.2
Features ............................................................................................................................. 2
1.3
Block Diagram ................................................................................................................... 3
1.4
Pin Layout Diagram .......................................................................................................... 4
1.5
Mask Option ....................................................................................................................... 8
2
POWER SUPPLY .............................................................................................. 11
2.1
Operating Voltage ............................................................................................................. 11
2.2
Internal Power Supply Circuit .......................................................................................... 11
2.3
Heavy Load Protection Mode ........................................................................................... 12
3
CPU AND MEMORY CONFIGURATION ..................................................... 13
3.1
CPU .................................................................................................................................. 13
3.2
Internal Memory ............................................................................................................... 13
3.2.1 ROM ........................................................................................................................................ 13
3.2.2 RAM ......................................................................................................................................... 13
3.2.3 I/O memory .............................................................................................................................. 13
3.2.4 Display memory ....................................................................................................................... 13
3.3
Exception Processing Vectors .......................................................................................... 13
3.4
CC (Customized Condition Flag) ..................................................................................... 14
4
INITIAL RESET ............................................................................................... 15
4.1
Initial Reset Factors .......................................................................................................... 15
4.1.1 RESET terminal ....................................................................................................................... 15
4.1.2 Simultaneous LOW level input at input port terminals K00–K03 ........................................... 15
4.1.3 Supply voltage detection (SVD) circuit ................................................................................... 16
4.1.4 Initial reset sequence ............................................................................................................... 16
4.2
Initial Settings After Initial Reset ...................................................................................... 17
5
PERIPHERAL CIRCUITS AND THEIR OPERATION ................................ 18
5.1
I/O Memory Map .............................................................................................................. 18
5.2
Watchdog Timer ................................................................................................................ 27
5.2.1 Configuration of watchdog timer ............................................................................................ 27
5.2.2 Interrupt function .................................................................................................................... 27
5.2.3 Control of watchdog timer ...................................................................................................... 27
5.2.4 Programming notes ................................................................................................................. 27
5.3
Oscillation Circuits and Operating Mode ........................................................................ 28
5.3.1 Configuration of oscillation circuits ....................................................................................... 28
5.3.2 Mask option ............................................................................................................................. 28
5.3.3 OSC1 oscillation circuit .......................................................................................................... 28
5.3.4 OSC3 oscillation circuit .......................................................................................................... 29
5.3.5 Operating mode ....................................................................................................................... 29
5.3.6 Switching the CPU clocks ....................................................................................................... 30
5.3.7 Control of oscillation circuit and operating mode .................................................................. 31
5.3.8 Programming notes ................................................................................................................. 32
5.4
Input Ports (K ports) ......................................................................................................... 33
5.4.1 Configuration of input ports .................................................................................................... 33
5.4.2 Mask option ............................................................................................................................. 33
5.4.3 Interrupt function and input comparison register ................................................................... 34
Summary of Contents for 0C88832
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