
Hardware
S1C621A0 TECHNICAL HARDWARE
EPSON
I-i
CONTENTS
CONTENTS
CHAPTER 1
DESCRIPTION .................................................................. I-1
1.1
Features .......................................................................... I-1
1.2
Block Diagram ................................................................. I-3
1.3
Pin Configuration ............................................................. I-4
1.4
Pin Description ................................................................ I-5
CHAPTER 2
CPU, ROM AND RAM ...................................................... I-6
2.1
CPU ................................................................................. I-6
2.2
ROM ................................................................................ I-6
2.3
RAM ................................................................................ I-7
CHAPTER 3
PERIPHERAL CIRCUITS ..................................................... I-8
3.1
Memory Map ................................................................... I-8
3.2
Power Supply ................................................................. I-13
Oscillation circuit power supply (VS1) ...................... I-13
LCD power supply ................................................... I-14
3.3
Oscillation Circuit ............................................................ I-15
Oscillation circuit control by software ...................... I-16
Programming notes ................................................. I-17
3.4
Input Ports (K00–K03, K10–K13) ................................... I-18
Input port data ....................................................... I-18
Input interrupt ........................................................ I-19
Programming note ................................................... I-19
3.5
Output Ports (R00–R03, R10–R13, R20) ....................... I-20
Output port data ..................................................... I-21
R12 and R13 (FOUT, BZ, BZ) .................................. I-22
3.6
I/O Ports (P00–P03) .................................................... I-24
Output data ............................................................ I-25
Input data ............................................................... I-26
I/O control (IOC) register ......................................... I-26
Notes on operation with pull-up resistors ................ I-26