
S1C88848 TECHNICAL MANUAL
EPSON
i
CONTENTS
Contents
1
INTRODUCTION .............................................................................................. 1
1.1
Features ............................................................................................................................. 1
1.2
Block Diagram ................................................................................................................... 2
1.3
Pins .................................................................................................................................... 3
1.3.1 Pin layout diagram ................................................................................................................... 3
1.3.2 Pin description ......................................................................................................................... 4
1.4
Mask Option ....................................................................................................................... 5
2
POWER SUPPLY ............................................................................................... 8
2.1
Operating Voltage .............................................................................................................. 8
2.2
Internal Power Supply Circuit ........................................................................................... 8
3
CPU AND MEMORY CONFIGURATION ...................................................... 9
3.1
CPU ...................................................................................................................................9
3.2
Internal Memory ................................................................................................................ 9
3.2.1 ROM ......................................................................................................................................... 9
3.2.2 RAM .......................................................................................................................................... 9
3.2.3 I/O memory ............................................................................................................................... 9
3.2.4 Display memory ........................................................................................................................ 9
3.3
Exception Processing Vectors .......................................................................................... 10
3.4
CC (Customized Condition Flag) ..................................................................................... 10
4
INITIAL RESET ............................................................................................... 11
4.1
Initial Reset Factors ..........................................................................................................11
________
4.1.1 RESET terminal ....................................................................................................................... 12
4.1.2 Simultaneous LOW level input at input port terminals K00–K03 ........................................... 12
4.1.3 Initial reset sequence ............................................................................................................... 12
4.2
Initial Settings After Initial Reset ...................................................................................... 13
5
PERIPHERAL CIRCUITS AND THEIR OPERATION ................................ 14
5.1
I/O Memory Map .............................................................................................................. 14
5.2
Watchdog Timer ................................................................................................................25
5.2.1 Configuration of watchdog timer ............................................................................................ 25
5.2.2 Interrupt function .................................................................................................................... 25
5.2.3 Control of watchdog timer ...................................................................................................... 25
5.2.4 Programming notes ................................................................................................................. 25
5.3
Oscillation Circuits ........................................................................................................... 26
5.3.1 Configuration of oscillation circuits ....................................................................................... 26
5.3.2 Mask option ............................................................................................................................. 26
5.3.3 OSC1 oscillation circuit .......................................................................................................... 26
5.3.4 OSC3 oscillation circuit .......................................................................................................... 27
5.3.5 Switching the CPU clock ......................................................................................................... 27
5.3.6 Control of oscillation circuit ................................................................................................... 28
5.3.7 Programming notes ................................................................................................................. 28
5.4
Input Ports (K ports) ......................................................................................................... 29
5.4.1 Configuration of input ports .................................................................................................... 29
5.4.2 Mask option ............................................................................................................................. 29
5.4.3 Interrupt function and input comparison register ................................................................... 30
5.4.4 Control of input ports .............................................................................................................. 32
5.4.5 Programming note ................................................................................................................... 34