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
S1C62740 TECHNICAL HARDWARE EPSON I-7
CHAPTER 2: POWER SUPPLY AND INITIAL RESET
POWER SUPPLY AND INITIAL RESETCHAPTER 2
2.1 Power Supply
With a single external power supply (3 V *1) supplied to VDD/VDDA
through VSS/VSSA, the S1C62740 generates the necessary internal
voltage with the regulated voltage circuit (<V
D1> for oscillators,
<V
C1> for LCDs), the voltage booster circuit (<VC2, VC3> for LCDs)
and the voltage dividing circuit (<GND> ≈ V
DDA/2, reference voltage
for analog circuit).
Figure 2.1.1 shows the configuration of power supply.
*1 Supply voltage: During A/D operation …2.4 to 5.5 V
During A/D stop …2.2 to 5.5 V
• External loads cannot be driven by the regulated voltage and voltage
booster circuit's output voltage.
• See Chapter 7, "ELECTRICAL CHARACTERISTICS" for voltage values.
Note:
• An external voltage can be impressed
to the GND terminal.
• Open V
RA terminal when VR1 is
impressed from the outside.
• Remove resistors between V
R1–VRA
and between GND–VRA when VR1 is
impressed from outside.
External
power
supply
Internal
circuit
Oscillation
circuit
LCD system
voltage booster circuit
LCD system
regulated voltage circuit
Oscillation system
regulated voltage circuit
V
DD
V
V
CA
V
C2
V
C3
CA
CB
CC
V
C1
V
C2
V
C3
V
V
C1
OSC1–4
COM0–3
SEG0–31
D1
D1
V
DDA
V
C1
LCD
driver
Analog system
reference voltage
generation circuit
GND
CH
CL
GND
VR
-VR
GND
AI0–4
A/D
converter
Analog system
voltage dividing circuit
V
SS
V
SSA
V
R1
V
R2
V
RA
/V
DDA
V
DD
GND
/V
SSA
V
SS
V
R1
V
R2
V
D1
V
C1
Fig. 2.1.1
Configuration of power supply