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-81
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (A/D Converter)
Five analog input terminals AI0–AI4 have been set in the A/D
converter.
Measured input
terminal and
measurement items
AIF
AI0
AI1
AI2
AI3
AI4
+
–
BUF
VR, -VR
generation
circuit
V
R1
V
R2
GND
-VR
VR
V
IN
GND
BF
To non inverted input
of integral AMP
S
10
S
11
S
12
S
13
S
14
S
2
S
3
S
4
S
5
S
6
It offers the following three type of measurements.
• Voltage measurement
(measurement of the voltage between the analog input terminal and the GND
terminal)
• Differential voltage measurement
(measurement of the voltage between two analog input terminals)
• Resistance measurement
(A/D conversion for thermistor and the like)
The analog input terminal to be used and the measurement items
are specified by software.
Fig. 4.12.2
Analog input terminal
configuration
(1) Voltage measurement
• Measurement terminal: AI0–AI4
• Input voltage: Max. ±320 mV (GND reference)
In this mode, one of the analog input terminal AI0–AI4 is specified
by software and the voltage between the corresponding terminal
and the GND terminal is measured.
AIx
+
–
BUF
VR, -VR
generation
circuit
V
R2
GND
-VR
VR
V
IN
GND
BF
S
1x
GND
VR = -V
R2
Fig. 4.12.3
Voltage measurement