
S1C88816 TECHNICAL MANUAL
EPSON
i
CONTENTS
Contents
1
INTRODUCTION .............................................................................................. 1
1.1
Features ............................................................................................................................. 1
1.2
Block Diagram ................................................................................................................... 2
1.3
Pin Layout Diagram .......................................................................................................... 3
1.4
Mask Option ....................................................................................................................... 5
2
POWER SUPPLY ............................................................................................... 8
2.1
Operating Voltage .............................................................................................................. 8
2.2
Internal Power Supply Circuit ........................................................................................... 8
2.3
Heavy Load Protection Mode ............................................................................................ 9
3
CPU AND MEMORY CONFIGURATION ..................................................... 10
3.1
CPU ..................................................................................................................................10
3.2
Internal Memory ............................................................................................................... 10
3.2.1 ROM ........................................................................................................................................ 10
3.2.2 RAM ......................................................................................................................................... 10
3.2.3 I/O memory .............................................................................................................................. 10
3.2.4 Display memory ....................................................................................................................... 10
3.3
Exception Processing Vectors .......................................................................................... 10
3.4
CC (Customized Condition Flag) ..................................................................................... 11
4
INITIAL RESET ............................................................................................... 12
4.1
Initial Reset Factors ..........................................................................................................12
4.1.1 RESET terminal ....................................................................................................................... 12
4.1.2 Simultaneous LOW level input at input port terminals K00–K03 ........................................... 12
4.1.3 Supply voltage detection (SVD) circuit ................................................................................... 13
4.1.4 Initial reset sequence ............................................................................................................... 13
4.2
Initial Settings After Initial Reset ...................................................................................... 14
4.3
Programming Note ........................................................................................................... 14
5
PERIPHERAL CIRCUITS AND THEIR OPERATION ................................ 15
5.1
I/O Memory Map .............................................................................................................. 15
5.2
Watchdog Timer ................................................................................................................26
5.2.1 Configuration of watchdog timer ............................................................................................ 26
5.2.2 Interrupt function .................................................................................................................... 26
5.2.3 I/O memory for watchdog timer .............................................................................................. 26
5.2.4 Programming notes ................................................................................................................. 26
5.3
Oscillation Circuits and Operating Mode ........................................................................ 27
5.3.1 Configuration of oscillation circuits ....................................................................................... 27
5.3.2 Mask option ............................................................................................................................. 27
5.3.3 OSC1 oscillation circuit .......................................................................................................... 27
5.3.4 OSC3 oscillation circuit .......................................................................................................... 28
5.3.5 Operating mode ....................................................................................................................... 28
5.3.6 Switching the CPU clocks ....................................................................................................... 29
5.3.7 I/O memory for oscillation circuit ........................................................................................... 30
5.3.8 Programming notes ................................................................................................................. 31