
Hardware
S1C62740 TECHNICAL HARDWARE
EPSON
I-i
CONTENTS
CONTENTS
CHAPTER 1
OVERVIEW ....................................................................... I-1
1.1
Features .................................................................................... I-2
1.2
Block Diagram ........................................................................... I-3
1.3
Pin Layout Diagram ................................................................... I-4
1.4
Pin Description .......................................................................... I-6
CHAPTER 2
POWER SUPPLY AND INITIAL RESET ................................ I-7
2.1
Power Supply ............................................................................ I-7
Voltage <VD1> for oscillation circuit and internal circuit ....... I-8
Voltage <VC1, VC2 and VC3> for LCD driving ......................... I-8
Reference voltage <VR1 and VR2> for A/D converter .............. I-8
Reference voltage <GND> for analog circuit .......................... I-9
2.2
Initial Reset ............................................................................... I-9
Reset terminal (RESET) ....................................................... I-10
Simultaneous low input to terminals K00–K03 .................... I-10
Watchdog timer ................................................................... I-11
Internal register at initial resetting ...................................... I-11
2.3
Test Terminals (TEST and CO) ............................................... I-11
CHAPTER 3
CPU, ROM, RAM ............................................................ I-12
3.1
CPU .......................................................................................... I-12
3.2
ROM ......................................................................................... I-12
3.3
RAM ......................................................................................... I-13
CHAPTER 4
PERIPHERAL CIRCUITS AND OPERATION ...................... I-14
4.1
Memory Map ............................................................................ I-14
4.2
Resetting Watchdog Timer ....................................................... I-20
Configuration of watchdog timer .......................................... I-20
Control of watchdog timer ................................................... I-21
Programming note ............................................................... I-21
4.3
Oscillation Circuit ..................................................................... I-22
Configuration of oscillation circuit ....................................... I-22
OSC1 oscillation circuit ....................................................... I-22
OSC3 oscillation circuit ....................................................... I-23
Control of oscillation circuit ................................................ I-24
Clock frequency and instruction execution time .................. I-25
Programming notes ............................................................. I-25