
S1C88409 TECHNICAL MANUAL
EPSON
i
CONTENTS
CONTENTS
CHAPTER
1OUTLINE ________________________________________________ 1
1.1
Features ......................................................................................................... 2
1.2
Block Diagram .............................................................................................. 3
1.3
System Configuration .................................................................................... 4
1.3.1 Single-chip system ...................................................................................... 4
1.3.2 Multi-chip system ....................................................................................... 4
1.4
Pin Layout Diagram ..................................................................................... 5
1.5
Mask Option ................................................................................................. 11
CHAPTER
2POWER SUPPLY ___________________________________________ 12
2.1
Operating Voltage ........................................................................................ 12
2.2
Internal Power Supply Circuit ..................................................................... 12
2.3
Heavy Load Protection Mode ...................................................................... 12
CHAPTER
3 CPU AND MEMORY ________________________________________ 13
3.1
CPU .............................................................................................................. 13
3.2
Internal Memory .......................................................................................... 13
3.2.1 ROM ........................................................................................................... 13
3.2.2 RAM (Data Memory, Display Memory) .................................................... 13
3.2.3 I/O memory ................................................................................................ 13
3.3
Exception Processing Vectors ...................................................................... 14
3.4
CC (Customized Condition Flag) ................................................................ 14
3.5
Chip Mode .................................................................................................... 14
3.5.1 MCU mode and MPU mode ...................................................................... 14
3.5.2 Bus mode ................................................................................................... 15
3.6
External Bus ................................................................................................. 17
3.6.1 Data bus ..................................................................................................... 17
3.6.2 Address bus ................................................................................................ 18
3.6.3 Read (RD)/write (WR) signals .................................................................. 18
3.6.4 Chip enable (CE) signal ............................................................................ 18
3.6.5 WAIT control .............................................................................................. 20
CHAPTER
4INITIAL RESET ____________________________________________ 21
4.1
Initial Reset Factors ..................................................................................... 21
4.1.1 RESET terminal ......................................................................................... 21
4.1.2 Simultaneous LOW level input at input port terminals K00–K03 ........... 22
4.2
Initial Reset Sequence .................................................................................. 22
4.3
Initial Settings at Initial Reset ..................................................................... 23
CHAPTER
5PERIPHERAL CIRCUITS AND OPERATION __________________________ 24
5.1
I/O Memory Map ......................................................................................... 24
5.2
System Controller and Bus Control ............................................................. 46
5.2.1 Bus mode settings ...................................................................................... 46
5.2.2 Address decoder (CE output) settings ...................................................... 48
5.2.3 WAIT state settings .................................................................................... 48
5.2.4 I/O memory of system controller ............................................................... 49
5.2.5 Programming note ..................................................................................... 50