A/D Converter; Features And Structure Of A/D Converter - Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual

IV-2 A/D CONVERTER

Features and Structure of A/D Converter

The Analog Block contains an A/D converter with the following features:
• Conversion method: Successive comparison
• Resolution: 10 bits
• Input channels: Maximum of 8
• Conversion time: Maximum of 10 µs (when a 2-MHz input clock is selected)
• Conversion range: Between V
• Two conversion modes can be selected:
Normal mode: Conversion is completed in one operation.
Continuous mode: Conversion is continuous and terminated through software control.
Continuous conversion of multiple channels can be performed in each mode.
• Four types of A/D-conversion start triggers can be selected:
Triggered by the external pin (#ADTRG)
Triggered by the compare match B of the 16-bit programmable timer 0
Triggered by the underflow of the 8-bit programmable timer 0
Triggered by the software
• A/D conversion results can be read out from a 10-bit data register.
• An interrupt is generated upon completion of A/D conversion.
Figure 2.1 shows the structure of the A/D converter.
AV
DDE
V
SS
AD0
AD1
AD2
Analog
AD3
AD4
decoder
AD5
AD6
AD7
#ADTRG
8-bit timer 0
16-bit timer 0
S1C33L03 FUNCTION PART
and AV
SS DDE
Successive
Analog
approximation
input
block
Figure 2.1 Structure of A/D Converter
EPSON
IV ANALOG BLOCK: A/D CONVERTER
block
Control circuit
Clock
Prescaler
generator
Control
registers
Data
register
Interrupt
control
circuit
Interrupt request
B-IV-2-1
A-1
B-IV
A/D