Specifications
Table Of Contents
- Technical Hardware
- 1 OVERVIEW
- 2 POWER SUPPLY AND INITIAL RESET
- 3 CPU, ROM, RAM
- 4 PERIPHERAL CIRCUITS AND OPERATION
- 4.1 Memory Map
- 4.2 Resetting Watchdog Timer
- 4.3 Oscillation Circuit
- 4.4 Input Ports (K00–K03, K10)
- 4.5 Output Ports (R00–R03)
- 4.6 I/O Ports (P00–P03, P10–P13, P20–P23)
- 4.7 LCD Driver (COM0–COM3, SEG0–SEG31)
- 4.8 Clock Timer
- 4.9 Stopwatch Timer
- 4.10 Programmable Timer
- 4.11 Serial Interface (SIN, SOUT, SCLK, SRDY)
- 4.12 A/D Converter
- 4.13 General-purpose Operation Amplifier (AMP)
- 4.14 SVD (Supply Voltage Detection) Circuit
- 4.15 Interrupt and HALT/SLEEP
- 5 SUMMARY OF NOTES
- 6 DIAGRAM OF BASIC EXTERNAL CONNECTIONS
- 7 CHARACTERISTICS
- 8 PACKAGE
- 9 PAD LAYOUT
- Technical Software
- 1 INTRODUCTION
- 2 BLOCK DIAGRAM
- 3 PROGRAM MEMORY (ROM)
- 4 DATA MEMORY
- 5 INITIAL RESET
- 6 PERIPHERAL CIRCUITS
- 6.1 Watchdog Timer
- 6.2 OSC3
- 6.3 Input Ports (K00–K03 and K10)
- 6.4 Output Ports (R00–R03)
- 6.5 I/O Ports (P00–P03, P10–P13 and P20–P23)
- 6.6 LCD Driver
- 6.7 Clock Timer
- 6.8 Stopwatch Timer
- 6.9 Programmable Timer
- 6.10 Serial Interface Circuit
- 6.11 Amplifier
- 6.12 SVD (Supply Voltage Detection) Circuit
- 6.13 A/D Converter
- 6.14 Sleep
- 6.15 Interrupt
- 7 SUMMARY OF NOTES
- APPENDIX
I-44 EPSON S1C62740 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
LCD Driver (COM0–COM3, SEG0–SEG31)4.7
Configuration of LCD
driver
The S1C62740 has four common terminals (COM0–COM3) and 32
segment terminals (SEG0–SEG31), so that it can drive an LCD with
a maximum of 128 (32 × 4) segments.
The power for driving the LCD is generated by the CPU internal
circuit so that there is no need to apply power especially from
outside.
The driving method is 1/4 duty dynamic drive depending on the
four types of potential, V
SS, VC1, VC2 and VC3. In addition to the 1/
4 duty, 1/3, 1/2 and 1/1 drive duty can be selected through the
software. The frame frequency is 32 Hz for 1/4, 1/2 and 1/1 duty,
and 42.7 Hz for 1/3 duty (f
OSC1 = 32,768 Hz).
LCD display ON/OFF may be controlled by the software.
Figures 4.7.1–4.7.3 show the drive waveform for 1/4 duty, 1/3
duty and 1/2 duty.
Note: "fOSC1" indicates the oscillation frequency of the OSC1 oscillation circuit.