Lucent Technologies MN10285K - Manual (Page 149)

Analog-to-Digital Converter
ADC Setup Examples
Panasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual
148
Panasonic
AN6BUF (example) x’00FF14’
6.5.2 Setting Up Hardware-Controlled Intermittent Three-Channel
A/D Conversion
This example illustrates multiple-channel conversion controlled by the hardware.
The ADIN2, ADIN1, and ADIN0 pins input analog voltage signals ( 0.0 V– 3.3
V) and the ADC converts the voltages to 8-bit digital values. It writes the results
to the registers periodically, each time timer 1 underflows.
Bit: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
— — — — — — — —
ANn
BUF7
ANn
BUF6
ANn
BUF5
ANn
BUF4
ANn
BUF3
ANn
BUF2
ANn
BUF1
ANn
BUF0
Figure 6-9 Timing of Software-Controlled Single-Channel A/D Conversion
Figure 6-10 Multiple-Channel A/D Conversion
1 2 3 4 10 11 12
VALID
ADIN6 converting
ANCTR
set
ANEN
State
Reference
clock
AN6BUF
AN6BUF
read
Interrupt
Slider 3 Slider 2 Slider 1
0
5
10
0
5
10
0
5
10
ch0 ch1 ch2
A/D converter data registers
Underflow
Timer 1
MN102
CPU core
MN102H75K